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Man Questions Wedding After Learning Fiancée Slept With His Sister’s Boyfriend

by Carolyn Mullet
December 22, 2025
in Social Issues

A Redditor’s engagement joy cracked open after a phone call he never expected.

Four years of dating, one shiny engagement ring, and a future that finally felt settled. Then his sister asked for a serious conversation, the kind that changes how you sit down.

What followed was a revelation buried for a decade. Back in high school, his fiancée had been the other woman in his sister’s first heartbreak. Not a rumor. Not a misunderstanding. A confirmed betrayal that his fiancée had quietly carried into adulthood, and into their relationship.

Now he’s stuck in a brutal emotional triangle. On one side, the woman he loves and planned to marry. On the other, his sister, whose pain he remembers vividly. In the middle, a truth that no one volunteered until the wedding was on the horizon.

Is this just ancient teenage messiness resurfacing at the worst possible time? Or is keeping a secret like this for four years a warning sign that deserves serious pause?

The internet had opinions, and they were anything but gentle.

Now, read the full story:

Man Questions Wedding After Learning Fiancée Slept With His Sister’s Boyfriend
Not the actual photo

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

My fiancee and I got engaged last month, and we’ve been in a relationship for 4 years.

I was very excited about marrying her and having her as a life partner until I learned something recently which is making me have second thoughts.

To provide some more context, my fiancee always seemed a bit nervous around my sister.

I asked my fiancee about it, and she just said they were old high school friends.

When I asked my sister, she too said the same thing, but she was always a bit cold to my fiancee.

This carried on the entire time we were dating, and my sister was always somewhat cold to my fiancee.

When I told her I proposed and was engaged, she congratulated me but she didn’t seem too excited or thrilled for me,

which surprised me because we are always each other’s biggest supporters and well wishers.

But, I did not make too much of it, and was really excited that I was engaged and was going to marry the love of my life.

However, last week, my sister called me for a serious chat. She said she always wanted to get it off her chest,

but that she didn’t want to interfere in my relationship but that she felt I had the right to know before marrying my fiancee.

She told me she was distant friends with my fiancee in high school, but that friendship was broken after her boyfriend had cheated on her with my fiancee.

She said my fiancee knew about their relationship but she still chose to h__kup with her boyfriend.

I was a bit shocked, because I remember consoling my sister for a few months after her boyfriend cheated on her.

I just didn’t know that the person he had cheated on with was my fiancee.

The next day, I asked my fiancee about it, and she fully admitted to it, but she was also in tears.

She said that was a horrible mistake she made in high school, and she felt guilty about it, and that she is a completely changed woman, and that experience taught...

While I do believe my fiancée that she is a changed woman, and that she is not the type to cheat, I am just having second thoughts about everything.

I still remember the hurt my sister felt in high school, and to now know that my fiancée was responsible for the hurt, it makes me look at her in...

AITAH for having second thoughts about marrying my fiancee?

This one hits a nerve because it lives in the gray space between growth and accountability.

Yes, people change. High school versions of us barely resemble our adult selves. But secrets don’t age the same way mistakes do. When something involves your partner’s family, silence stops being neutral.

What makes this story heavy is not the teenage hookup. It’s the four years of omission. The awkwardness around the sister. The quiet hope that the truth would never surface. That emotional math changes once marriage enters the picture.

It’s not about punishment. It’s about trust, timing, and whether honesty arrives by choice or by force.

That tension deserves more than a rushed answer.

At the heart of this story is a collision between past behavior and present trust.

Psychologists consistently note that people do grow significantly after adolescence. According to the American Psychological Association, personality traits continue to evolve well into adulthood, particularly impulse control, empathy, and moral reasoning.

So yes, a mistake made at 16 does not automatically define someone at 26.

But relationship experts draw a clear distinction between past behavior and present transparency.

Dr. John Gottman, one of the most cited relationship researchers, emphasizes that trust in long-term partnerships builds through consistent honesty, especially around difficult truths. Avoidance, even when well-intentioned, erodes trust over time.

In this case, the fiancée did not lie outright when asked directly years ago. But she also did not disclose a truth that deeply affected her partner’s sibling, someone who would permanently remain in their shared life.

That omission matters.

Research published in the Journal of Social and Personal Relationships shows that perceived secrecy in romantic relationships correlates strongly with reduced relationship satisfaction and increased emotional distance. Partners often feel more hurt by concealment than by the original act itself.

This explains why the Redditor feels unsettled even while believing his fiancée has changed. His reaction is not about fear of cheating. It’s about realizing that his understanding of their shared history was incomplete.

There is also a family systems layer here.

When unresolved conflict exists between siblings, and one partner occupies the center of that conflict, tension often resurfaces during major life milestones like marriage. Family therapists note that unspoken resentments tend to emerge around weddings because they symbolize permanence.

What should someone do in this situation?

Experts recommend slowing down rather than making immediate decisions. Having second thoughts does not equal ending the relationship. It signals a need for deeper conversation.

Productive next steps include discussing why the fiancée chose not to disclose earlier, how she views accountability now, and how she plans to rebuild trust with both partners involved. Couples counseling can help facilitate this without turning it into a blame cycle.

Marriage is not only about love. It’s about how couples handle uncomfortable truths when they surface.

Check out how the community responded:

Many Redditors focused on personal growth and argued that high school mistakes shouldn’t define adulthood.

Far_Prior1058 - NTA. People do stupid things in high school. Ten years changes a lot.

AngryBlackGuyy - High schoolers are basically kids. Growth matters.

changelingcd - Teen relationships are unstable. This shouldn’t outweigh four good years.

Others zeroed in on the secrecy and saw it as the real issue.

Emotional_Area_1177 - The problem is she hid it for four years. That feels wrong.

Reddit User - She was never going to tell you. That’s a red flag.

KWS1461 - Would you want to be judged by your worst mistake? Still, trust needs rebuilding.

A third group questioned the timing and motives of the sister.

positive-vibes79 - Why didn’t your sister say something earlier? This timing feels strange.

ImpassionateGods001 - If it mattered so much, it should’ve come up years ago.

Foreign_Fall_8266 - Letting the relationship grow before dropping this feels calculated.

countytime69 - Dating her brother took guts. That alone is wild.

This story doesn’t have a clean villain. A teenager made a selfish choice. An adult chose silence. A sister carried unresolved pain. Now a future marriage sits at the crossroads of all three.

Having second thoughts doesn’t mean the relationship is doomed. It means the foundation just shifted, and foundations deserve inspection before vows lock them in place.

Trust isn’t about perfection. It’s about how truth enters the room.

So what do you think? Should teenage mistakes stay in the past if real growth followed? Or does keeping a family-level secret for years change everything?

WHAT DO YOU THINK OF THIS STORY?

WHAT DO YOU THINK OF THIS STORY?

OP Is Not The AH (NTA) 1/1 votes | 100%
OP Is Definitely The AH (YTA) 0/1 votes | 0%
No One Is The AH Here (NAH) 0/1 votes | 0%
Everybody Sucks Here (ESH) 0/1 votes | 0%
Need More INFO (INFO) 0/1 votes | 0%

Carolyn Mullet

Carolyn Mullet

Carolyn Mullet is in charge of planning and content process management, business development, social media, strategic partnership relations, brand building, and PR for DailyHighlight. Before joining Dailyhighlight, she served as the Vice President of Editorial Development at Aubtu Today, and as a senior editor at various magazines and media agencies.

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