AITA for telling my BIL that someone is going to punch his girlfriend one day?

When I first learned about polyamorous relationships, I quickly realized they weren’t something I’d ever be interested in. But that’s just my personal view everyone has the right to choose the lifestyle that makes them happy.

In this story, even though a couple agreed to be in a poly relationship, things took a messy turn when the man’s girlfriend tried to hit on his sister-in-law’s boyfriend. The sister-in-law finally snapped, but the girlfriend twisted the story and lied about what really happened, creating unnecessary drama within the family. Keep reading to see how everything unfolded in the end!

More info: Reddit

image credit: Freepik

The OP’s older sister and her fiancé are in a polyamorous relationship, but his girlfriend has turned it into her entire personality constantly craving attention and trying to place herself at the center of everything.

At her sister’s wedding, the OP noticed that her brother-in-law’s girlfriend, Sally, had pulled her boyfriend aside — and was blatantly flirting with him.

image credit: Freepik

The OP immediately shut Sally down, furious at what she was doing. But afterward, Sally twisted the entire situation and lied to her boyfriend, who then approached the OP and demanded that she apologize to her.

image credit: freepik

Naturally, she refused to apologize, so the family arranged a group call to hear Sally’s version of events — and her story was all over the place, full of inconsistencies.

Her lies quickly unraveled as she kept tripping over her own story, and it became obvious to everyone that the OP had been telling the truth all along.

image credit: freepik

Although the brother-in-law eventually apologized to the OP, she was stunned that he still chose to stay with Sally instead of ending the relationship.

Today’s story is a tangled one, centered around a family conflict shared by the original poster (OP). Her older sister and her fiancé are in a polyamorous relationship, but OP has never been a fan of her brother-in-law’s girlfriend, Sally. Sally thrives on attention, treats polyamory as her whole identity, and often looks down on anyone who doesn’t live the same lifestyle.

However, things escalated dramatically during the couple’s wedding. OP walked in on Sally openly flirting with her boyfriend, even cornering him despite knowing he’s socially anxious. He looked visibly relieved when OP stepped in. OP firmly told Sally to back off and to pursue someone who was actually single.

She assumed the situation was over — but Sally wasn’t done causing chaos.

A few days later, OP received a call from her brother-in-law demanding that she apologize to Sally. That’s when she realized Sally had completely flipped the story, making OP appear jealous and hostile. OP refused to apologize, knowing she had done nothing wrong.

To clear the air, the family decided to get on a call and let Sally explain her version of events. But her story quickly fell apart; she kept contradicting herself, making it clear she had been lying. Once everything came to light, OP’s brother-in-law apologized for the drama — yet OP was shocked when he still chose to remain with Sally despite her toxic behavior.

Polyamory is actually far more common than many people think. Studies show that one in nine Americans has been in a polyamorous relationship at some point, and one in six is open to trying it. But even with its growing visibility, that doesn’t mean anyone should feel pressured into it—or be judged for preferring monogamy. That kind of attitude is simply entitlement.

Readers pointed out that poly relationships work only when everyone involved gives clear, enthusiastic consent. Sally completely crossed that boundary when she tried to push a monogamous man into something he never agreed to. Many felt her actions were predatory and ethically wrong, so the OP had every right to call her out. Instead of taking responsibility, Sally twisted the story to make herself look like the victim, creating unnecessary chaos within the family.

Psychological research shows that manipulative individuals often rely on deception, coercion, and subtle pressure to maintain control in relationships. Experts also note that this kind of behavior can sometimes stem from deeper personal or mental health struggles. Whatever Sally may be dealing with internally, none of it excuses the harm she caused or the drama she initiated.

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