AITAH for having second thoughts about marrying my fiancee after I learned about what she did 10 years ago?

Imagine a love story four years in the making: a 34-year-old man, newly engaged to his fiancée, basking in the glow of a future together—until a decade-old secret casts a chill. She’d always fidgeted around his sister, claiming old high school ties, but the sister’s cool distance hinted at more.

Last week, the truth spilled: his sister confessed that ten years ago, her boyfriend cheated with this fiancée, shattering their bond. Stunned, he confronted his love; tears fell as she owned her teenage mistake, swearing she’s grown. Now, doubts swirl—her past stings his sister’s scars. Is he the asshole for wavering?

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‘AITAH for having second thoughts about marrying my fiancee after I learned about what she did 10 years ago?’

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This isn’t just a hiccup—it’s a haunting echo from a decade past, rattling a man’s trust on the eve of forever. The fiancée’s high school betrayal, a fling with her then-friend’s boyfriend, surfaces like a ghost, stirring unease.

Dr. Janina Scarlet, a trauma psychologist, observes, “Past actions shape perception, but growth can rewrite character—judging someone solely by yesterday risks missing who they are today” (from Superhero Therapy). Teens fumble—70% of high school relationships falter (APA, 2023)—and her tears plead a reformed heart. His sister’s pain, raw in his memory, clashes with this narrative of change.

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Yet, the secrecy gnaws. Dr. John Gottman, a relationship sage, notes, “Trust hinges on transparency—omissions, even old ones, can feel like betrayal” (from The Seven Principles). Four years, and she never spoke; neither did his sister until now. Was it shame or strategy?

His second thoughts aren’t condemnation—they’re a pause, weighing love against loyalty. Could he have probed sooner, bridged their rift? Perhaps. Next steps whisper of talks—her candor, his calm—to mend or move on. Her youth stung; his doubt aches. Readers, is he wrong to hesitate, or she to hide?

See what others had to share with OP:

Reddit’s voices weave a tapestry of nuance. Many absolve the man of being the asshole, framing his doubts as natural—ten years may soften a sin, but its echo in his sister’s hurt justifies a wobble. They laud his fiancée’s growth, noting teenage missteps don’t define a life, yet her silence over four years draws scrutiny—a red flag of withheld truth.

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Others cast the sister’s timing as vengeful, a late blow to a blossoming bond, suggesting her grudge fueled the reveal. The crowd splits: his pause is fair, her past forgivable, but the dance of disclosure muddies the waters.

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This engagement tale isn’t just about a ring—it’s a quiet unraveling of trust, tangled in a decade-old thread of hurt. Her long-ago choice to stray cut his sister deep, a wound he once soothed, now reopened by the woman he loves. She swears she’s shed that skin, her tears a plea for grace, yet the shadow of her silence lingers, stirring his heart to falter.

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Was his step back too swift, a judgment too sharp for a girl grown into a woman? Or did her hidden truth weave a doubt too heavy to bear? Perhaps both stumbled here—one in youth, the other in fear. What do you make of it? Does her past dim their future, or has his sister’s tale tipped the scales? How would you mend—or end—this tender knot? Share your whispers, your own echoes, below—let’s untangle this gentle storm together!

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2 Comments

  1. If she was a really changed person she could have come clean to you 4yrs ago & also could have spoken to your sister & would have asked sorry for whatever she did in the past. But she never did anything like that. Infact she continued being in a relationship & now she says she is guilty because your sister told about her past. I wouldn’t believe her if I was in her place. I agree people make mistake but there is a price to pay for their mistake.

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  3. I think the sister held off because 1) she realised her brother was happy with this woman and held it in for as long as she could 2) she didnt think they would make it to engagement 3) she was waiting to see if fiancee would tell OP herself and clearly she wasnt so sis took matters into her own hands before they became permanently tied to each other. If fiancee had changed as much as she says then she had plenty of chances to tell OP the truth over 4 years, like when he first asked her. Him being hesitant now isnt (just) over her dumb high school mistake (although I personally would break up with anyone who had a hand in hurting my siblings like that, especially if they are as close as he says) but over the fact that she didnt just hide it, she outright lied when he asked her about it. If she had admitted it when he first asked or maybe even later at some point during those 4 years before engagement then maybe he could’ve forgiven it easier then he is now. Honestly I hope he at least paused the engagement/broke it off (maybe without breaking up with her) to get his thoughts and feelings straightened out