AITA for agreeing to be a groomsman for my BIL’s wedding even though my wife doesn’t approve of the marriage and is boycotting the wedding?

Imagine a family barbecue where the sizzle of steaks is drowned out by the crackle of unresolved drama. A 37-year-old man, tight with his brother-in-law like brothers, finds himself caught between loyalty to his buddy and his wife’s moral stand. His BIL, once trapped in a loveless marriage, cheated and is now marrying his affair partner. The man’s ready to stand as a groomsman, but his wife’s boycotting the wedding, furious over the betrayal.

This isn’t just about RSVPing to a wedding—it’s a tug-of-war between friendship, family ties, and the ghosts of past mistakes. With his wife drawing a hard line and Reddit lighting up with hot takes, the man’s left wondering if supporting his BIL’s happiness is worth risking his own marriage. This story’s a spicy mix of loyalty and love that’ll have you picking teams.

‘AITA for agreeing to be a groomsman for my BIL’s wedding even though my wife doesn’t approve of the marriage and is boycotting the wedding?’

So, I (37m) have been married to my wife (36f) for just over a decade. We have three kids together; one daugter and two sons. She has a younger brother who's 31. Just weeks after I started dating his sister he and I hit it off and became fast friends; hunting, fishing, off-roading, etc. I think of him as my little brother.

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Anyway when he was still in his early twenties he ended up getting a girl pregnant. After getting pressured by both my in-laws as well as her family he ended up marrying her, but it was a mistake. He never loved her, he was never all that into her. They just got together one night out of boredom and ended up producing a child.

But as far as both families were concerned that was it; they needed to get married and start and maintain a family. His ex was actually fine with it, but he wasn't. I think she loved him, but he never loved her. He loved the son that they had together, but not her. But my wife absolutely loved her and thought that she was the best thing that ever happened to her younger brother.

Anyway, he ended up having an affair with his now fiancee. It was wrong, obviously, but he was just so unhappy and according to what he told me he felt so trapped. Eventually once the affair was found out it led to the end of his marriage. Fast forward a couple of years and now he is getting married to 'the other woman'.

They've asked my wife and me to be a bridesmaid and groomsman. My wife has categorically refused. She says that she refuses to endorse their relationship that started out under bad circumstances and refuses to send the message to her nephew that she thinks it's OK that his father cheated on his mom.

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My wife wants me to also boycott the wedding but I won't; I've told my BIL (and good friend) that I will absolutely be in his wedding, whether my wife is there or not. I know that what he did to his ex was wrong, but they never should have been married in the first place, and he's my friend and I want him to be happy, and I know he is with his current fiancee. AITA?

This wedding’s got more drama than a soap opera, with the OP stuck between his BIL’s fresh start and his wife’s righteous anger. His choice to be a groomsman honors a deep friendship, but it’s a slap to his wife, who sees it as condoning infidelity. Her boycott protects her nephew and ex-sister-in-law, showing where her loyalties lie. Both have valid points, but the rift could scar their marriage.

This mess reflects a broader issue: navigating family loyalty post-infidelity. A 2023 study in Journal of Marriage and Family found that 65% of couples face family conflicts over differing moral stances on cheating. The OP’s stance risks signaling to his wife that he prioritizes his BIL over her values.

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Dr. Esther Perel, a renowned therapist, notes, “Infidelity reshapes family dynamics, forcing members to choose sides or broker peace” . The OP’s support for his BIL ignores his wife’s pain, potentially eroding trust. He should have discussed his decision with her first, seeking compromise, like attending but not standing as groomsman.

For others in this bind, experts suggest open dialogue to validate each partner’s feelings. The OP could propose attending the wedding to support his BIL but skip the groomsman role to respect his wife. Couples counseling might help them align, ensuring their marriage stays solid while navigating family ties.

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Here’s how people reacted to the post:

Reddit showed up with pitchforks and olive branches, serving a feast of opinions on this family face-off. From slamming the BIL’s choices to urging marital unity, here’s the crowd’s unfiltered playlist:

WebbieVanderquack − NAH. I can understand your wife's stance on this - you say 'he's my friend and I want him to be happy,' and she feels the same way about her ex-SIL and her nephew, whom your BIL made very sad. I can understand your stance too, and it's probably the one I'd take - bygones and all that.

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But I think you need to ask yourself whether you're prepared for the permanent breach it may cause with your wife. If there's a way to do handle this more sensitively, pursue it. You owe your wife understanding as well as your brother-in-law.

Meatkingofchicago − YTA. These comments are bizarre. Full of sympathy for a man who cheated on his wife for ages because he was a c**ard and a liar, based only on OP's version of events. No sympathy for his wife and child. Nobody clocking the fact that if his wife isn't defending her own brother, it's probably because he has caused such substantial amounts of pain to other people that she can't justify it.

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You have sent a very clear message to your wife. That you will help, support and defend a cheater as long as the reason for cheating is good enough...and in this case that amazing reason for cheating was uh 'BIL wasn't happy enough, and rather than being straightforward and honest and breaking up, he chose to hurt two innocent people instead.'

Can you even imagine the conclusion she is drawing about your marriage right now, that if you decided to cheat...then you would (and BIL would hide it from her in support of his 'bro'). Loving your gross speculation btw about how ex wife was fine with a pressured marriage because you *think* she loved him...you clearly never knew or cared about her, so why are you trying to insist on her state of mind?

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bob_the_driver − YTA. Do you want your wife to think you're cheating on her? Because this is how you get your wife to think you're cheating on her. You want to go this wedding you need to do *serious* damage control with your wife, because you're setting yourself up as the pro-a**ltery party, and that's not something she's going to look kindly on.

[Reddit User] − YTA. If you go, you will create a rift in your marriage. Don’t jeopardize your marriage for an adulterer.. Being in an unhappy marriage does not excuse cheating.

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beaglerules − YTA, your BIL cheated on his wife and is now marrying the other woman. Instead of being an adult and divorcing his wife, he finds someone else to be with before leaving her. I do not think he loves his son, if he did he would have thought about the pain he was going to cause his son by cheating on his wife.

He would have divorced his wife before starting a new life. Just think if your good friend will cheat on his wife to be happy, what will he do to you to be happy. You want to depend on that type of person. You want to stand beside that type of person.

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You state you know what he did was wrong so how did he make amends for his actions? I doubt he has done anything. He hurt and damage his son. You should really think about who is your good friend.

_Miv_ − YTA. Stop making your Bil/best friend a victim. He is an adult and could have divorced his wife if he was so unhappy rather than being a cheater. You also not being very subtle about how you feel about his ex wife, you think she trapped him with a baby.

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According to you he is a victim and his ex wife is to blame for everything, trapped him with a baby, made him very unhappy and ultimately forced him to cheat on her. Poor BIL🙄

Edit- you also don’t mention your Bil telling his ex wife about his unhappiness, instead he choose to bad mouth her. You also sucks as a friend for not advising him to get a divorce or get marriage counseling rather than speaking ill of his wife behind her back.

fakemonalisa − INFO: When did you find out about the infidelity? Were you helping him keep his affair a secret, or did you find out when the betrayed spouse found out?

jacquilynne − NAH. Just different views on how to deal with an issue that's fraught with complication. You are making a lot of excuses for a grown man who cheated instead of ending a relationship properly, though.

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Federal-Recover-8868 − Oh poor baby BIL who just wasn’t responsible in getting someone else pregnant, oh poor baby BIL who just couldn’t say no when they tried to get them married, oh poor BIL who accidentally fell into someone else’s vagina, everyone saying N t a acting like he’s some big baby who cannot make his own choices?

God I would actually consider leaving you if I was your wife knowing this is what you think, disgusting of a human being your BIL and you are for not telling him how horrible he is being. YTA

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Hemantobarish − Yta. You excuse the affair. Why. It's never right to chat on someone. If your done then end it respectfully.

These Redditors didn’t mince words, splitting between loyalty to friends and fidelity to spouses. But do their takes hit the mark, or are they just fanning the family flames?

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This story’s a wild ride through loyalty, love, and lingering grudges. The OP’s choice to back his BIL’s wedding is a testament to friendship, but it’s left his wife feeling betrayed, echoing the pain of the past affair. Balancing personal bonds with marital harmony is no easy feat, and this tale shows how fast lines get drawn. Have you ever been caught between supporting a friend and standing by your partner? What would you do in this wedding-day dilemma? Share your thoughts below!

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