[Shocking] My GF sisters boyfriend has a crush on her?

Shirley Stafford Hours
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In a cramped apartment buzzing with late-night tension, a young couple’s trust teeters on the edge. A 25-year-old man stares at his girlfriend’s phone, where a jaw-dropping text from her sister’s boyfriend—“Let’s f**k”—lights up the screen. What started as uneasy vibes over flirty dances and cozy photos has spiraled into a full-blown relationship crisis, with doubts swirling like smoke in a crowded bar.

This Reddit rollercoaster yanks us into a tangle of love, loyalty, and family ties gone awry. The boyfriend’s gut screams betrayal, but his girlfriend’s denials and a shaky “hacked account” excuse muddy the waters. This juicy drama hooks you with a raw exploration of trust, testing the limits of love in a web of intertwined relationships. Get ready for a story that’ll have you picking sides and second-guessing intentions.

‘[Shocking] My GF sisters boyfriend has a crush on her?’

I’m [25/M]. I started dating this girl [22/F], it’s only been 3-4 months, but ALOT has happened since then. She has a sister [18/F] and her sister has a boyfriend [21/M] who have been together for 6 months. When I first met her sister and her sister bf, I thought they were cool, we always hung out and even lived together in one room at one point.

My gf and her sisters boyfriend got along pretty well, but sometimes I think it was too much. Little by little I started noticing something weird about her sisters boyfriend. In the beginning I felt that he was too friendly with my gf, like too close but I always thought “maybe I’m trippin, that’s just how they are, it’s nothing” and left it alone..

Then more weird s**t happened. Like one night, all 4 of us went out to a bar, he grabbed my gf and started to dance. Nothing wrong with that, but what was weird to me was the way he then started to grab her and dance with her like it was a back in the day basement party.

It was weird to me bc she tells me that they’re like a brother and sister. Brothers and sisters don’t dance that way. I ignored that situation and kept it moving. Another time we went out again and right before going in the bar, he decided he wanted to take some pictures.

So he gives my gf sister his phone and tells her to take a picture of them. They switch and my gf takes a pic of them two. The weird part was that if you were to compare both pics side by side and I asked you, which one of these two is he in a relationship with, you would pick the one he took with my gf.

A picture says a thousand words. While my gf was just taking a picture just to take it, the way he grabbed her and looked at her was basically how me, as her boyfriend would grab her and look at her. She posted that pic but deleted it after I said it was weird and people kept asking her “who’s the lucky guy” .

At this moment I was 80% sure that this kid had something for my gf. As time went on and my gf and I got real serious, his behavior towards me started to change. Every time i would Hug and kiss my gf or show her any affection, I’d feel the hate in his eyes.

He’d mention to my gf how things are different now, how she chose me over her “family” (him and her sister). He would make plans to go out to eat but he would make it clear that he just wants them 3 to go. When my gf would say no, he’d get angry.

It got to the point where one night my gf sister and her sister bf came over. Everything was all good. I wasn’t there yet but when I arrived, she mentioned he was being weird towards me. It was like that the rest of the night.

When they left, I finally decided to have that talk with my girlfriend. We had a long talk about that situation and other things. At first she didn’t see things that way I seen them but started to put two and two together. She didn’t want to accept the possibility that her sisters boyfriend could want her.

She was not convinced But agreed that she might have unknowingly condoned his actions and that she’ll be a little less friendly. At this time it was 10am, we still hadn’t slept. Her phone made the notification noise. I looked over at the phone which was next to me, and it read: “Lets f**k”.

At this moment, we’re both in shock. I grabbed the phone and showed her the DM.. It was from her sisters boyfriend.. Her: “maybe that’s them playing around”. Me: “you don’t play around like that”. Her: “it could have been my sister writing that”

Me: “okay then, if that’s what you think, let’s call. If you’re sister picks up, we pay attention to how she sounds. If she sounds like she’s just waking up, it wasn’t her playing games. But if he picks up, you go along with it, to see how far he’ll go.”. Her: “okay”. My GF calls, Her sister answers, in a groggy voice.

Like she had just woken up.. GF: “hey what are you doing?”. Sister: “I was sleeping what’s up”. GF: “Where’s your BF?”. Sister: “he’s laying next to me”. GF: “look at what he just sent me”. Her sister hangs up.. We call back 15 mins later to give them a chance to talk.

When We call back, gf sister answers. In the background, we can hear that they were arguing. A few seconds later, she hangs up and we don’t hear from her again for the rest of the day. A few days later, they explain that his page got hacked and it was one of his exes that had wrote that.

Idk how he managed to make his girlfriend believe that but it must have been tough. My gf believed him, but still had her doubts. I in the other hand, don’t believe it for various reasons. My gf and I spoke about it things and she said that she’ll keep her distance.

Either way I let it go and decided to move on. He would continue to come around but it wasn’t the same.. Few days went by. Yesterday, I call her to talk and see how her day is going. She picks up, crying. She says she’s at her sisters house. Her sister was being taken by ambulance to the hospital because she couldn’t breathe.

I tell her to call me back asap. Time went by and I call to see what’s going on. She picks up, i ask her what happened. She says she’s home, her sister is doing fine, she’s at the hospital with her parents.. Me: “how come you aren’t at the hospital with her also?”

Her: “they wouldn’t let us in the room, only my mom and dad, and I was hungry so we left.. Me: “who are you with?”. Her: “My sisters boyfriend, I told him to come instead of waiting there. “ At this moment, I am bothered and disappointed. After all that we’ve been through, You’re alone, in a house, with someone that you know I don’t feel comfortable with.

That’s what I wanted to say, but did not say it bc I was on speaker. So we continue to talk while she starts to cook. There comes a point where her phone dies. I give her 8-10mins to call me back. (Takes 2-3mins for her phone to turn on). She doesn’t call, so I call her. No answer.

I wait 5 more mins and call again, no answer. I wait longer than 5mins this time and call. She picks up and says her phone died.. Me: “how come you didn’t call back after it died?” (She usually does right away) Her: “I was on the phone with my sister, she’s ready to leave the hospital, now we have to find my parents and her a ride”. Me: “oh”

Her sisters boyfriend finds a ride and leaves to pick them up from the hospital. My girlfriend stays and we continue to talk until she goes to shower. She calls back and her sister is there along with her boyfriend.

We talk about the situation, and I patiently wait for them to leave so I can talk to my gf about how I felt bothered that she was there alone with him. When they finally leave, I express myself to her and tell her how I felt. From that point forward, a 4 hour argument commences.

- She says that I have no right to feel the way I felt. That’s her “brother in law”. And that there was nothing at all wrong with him being alone with her. I tell her, that I do have the right to feel bothered. It might be your brother in law but things changed when you received that text message from him.

I feel disappointed bc you said you would keep your distance. Being alone in a house with him is not keeping your distance.. I’d like to know what you guys think. Am I overreacting? Or do i have a point.. Am I the only one that thinks it’s weird? What would you do in my shoes?

Relationships thrive on trust, but this story shows how quickly it can crack. The sister’s boyfriend’s behavior—flirty dancing, suggestive photos, and a brazen text—crosses clear boundaries, fueling the OP’s suspicions. The girlfriend’s dismissal, chalking it up to a “hack” or sibling-like bonds, risks eroding trust further, especially when she breaks her promise to keep her distance.

Dr. Shirley Glass, a renowned psychologist, wrote in Not “Just Friends”, “Emotional intimacy with someone outside the relationship can be as damaging as physical infidelity.” The sister’s boyfriend’s actions suggest an inappropriate attachment, and the girlfriend’s reluctance to fully address it may signal denial or discomfort with confrontation. Her time alone with him during a crisis only deepens the OP’s valid concerns.

This reflects a broader issue: navigating boundaries in close-knit family circles. A 2019 study by the Journal of Social and Personal Relationships found 25% of young couples face trust issues due to external friendships. Clear communication and mutual respect are crucial to prevent misunderstandings.

Advice: The OP should calmly express his boundaries, focusing on how the girlfriend’s actions affect trust. She could benefit from setting firmer limits with her sister’s boyfriend. Open dialogue can help rebuild confidence in the relationship.

Heres what people had to say to OP:

Reddit dives into this tangled drama with a mix of blunt advice and sharp skepticism. Many users urge the OP to trust his gut, pointing to the sister’s boyfriend’s blatant oversteps and the girlfriend’s questionable dismissals. Others call her naive at best, with some suspecting deeper betrayal, citing the suggestive text as a red flag too big to ignore.

The “hacked account” excuse draws eye-rolls, with commenters arguing it’s a flimsy cover for inappropriate behavior. These Reddit opinions pack a punch, slicing through the haze of excuses with raw honesty. They amplify the stakes of this trust tug-of-war, leaving no room for sugarcoating.

[Reddit User] − This was stressful just to read, why put up with all this high school drama?

[Reddit User] − The only time a guy has texted me 'Let's f**k' is of we've already done it before.

Idenkiteki − Lmao well first thing first. It’s the year 2018 why would his ex hack his account and then send a message to the sister of all the random people she could have picked. Do you really believe someone really took the time to research in the year 2018 instead of straight up exposing him?

Well now second is that this relationship is like nearly done the trust has wavered and that won’t change until her sister dumps him. Which clearly won’t happen since they fell for my ex must have have hacked me. “My ex hates me so much she hacked me to ruin me from being happy” but back to the main point.

I’m not going to tell you what to do but tell you it’s your choice now to decide if way this continues how much nor can you take before you explode again? (My guess is one more solo hang out). Dude y’all just started dating and it’s already stressful? For me i would be out. You’re 25 man don’t let the thought of I’m going to be single scare you.

[Reddit User] − Dude, your gut is ***not*** wrong. At best, your girlfriend is unforgivably naive, at worst, she's cheating on you with her sister's boyfriend (which honestly I'm leaning towards this.) It's time to cut your losses and run. You basically need to tell her that her actions are showing a deep disrespect and disregard for you and your relationship.

She's acting like a child and playing stupid when it comes to pointing out all the issues that any functional adult can spot a mile away. When people play these kinds of games this far into their lives, they are unlikely to change. You deserve better and you know it.

shipcapitan − * Your girlfriend grinds on this guy. * Your girlfriend is fine with getting texts from this guy saying 'let's f**k'. * Your girlfriend 'believes' that this guy's phone was hacked. I don't think this guy is the problem. I suspect that your girlfriend has been aware of this guy's feelings for a long time and she likes it.

She doesn't want to date him and she doesn't really LOVE him, but she enjoys the s**ual tension and the feeling of being wanted by another man. I’d be shocked if they haven’t kissed or fucked before.. And she knows that you're dumb enough to get fooled by it.

AdamtheGrim − 3-4 months??? Dude, f**king *cheese it*

[Reddit User] − ##**he’s been f**king your girl the whole time**

SwarthyManatee − This could just add fuel to the fire, but from the way that you've described it, I can't help but wonder. Do you think your girlfriend is being honest with you? Do you think it's too convenient that she disbelieves a mountain of evidence this strongly? Do you think she tries a little too hard to defend him?

The way that you've written this makes me wonder if you are starting to have trust issues not just with him, but with her. Do you trust her completely? This is a very difficult situation to navigate because she hasn't given you any overt signs that there is more going on here than should be believed... but there's a lot going on under the surface here.

I DO NOT want to inject uncertainty into your mind where there is not already some, I DO want you to consider that perhaps some of the friction in your relationship might be because it is testing your trust in her.

scapegoatyoga − I realize that her sister being in the hospital is not a good time to bring it up, but sister's BF is taking advantage of the situation to spend more time with GF, also. OP she turned her phone off for like 15 mins while she was with him and then took a shower.. 'If it looks like a duck...'

Take this time to consider your options/exit strategy and then you can have the tough conversation after sister is released.. Is her breathing trouble due to a panic attack/potentially related to her BF's actions?

Bedtimeshine − Dude number 1. Handle things in the moment. If a guy grabbed my gf to dance like that we would be having words. Right then and there 2. You should have confronted him 10 times over. 3. Your gf is now officially THE problem. 4. There is more going then you think.

No one sends a “lets f**k” text to their gfs sister that confidently without past interactions making them think it’s welcomed. 5.) she needs to face consequences. She broke her promise and is now changing her tune. She’s hiding s**t. Stop being a schmuck and end it. Stop trying to talk about it. She’s not innocent in this I promise.

This messy tale of texts and trust is a gut-punch reminder that love doesn’t thrive in denial. The OP’s doubts, fueled by a shady text and broken promises, clash with his girlfriend’s explanations, leaving their relationship on shaky ground.

It’s a raw, relatable story that probes the fragile line between intuition and evidence. Have you ever faced a similar relationship red flag? Drop your stories below—let’s keep the convo going!

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