Sisters Infidelity: AITA for Skipping Her Wedding?

A 28-year-old woman refused to attend her sister’s wedding after a betrayal that didn’t just sting, it rewrote the whole family history. And when she finally said the quiet part out loud, her sister flipped it into a “you’re ruining my special day” situation.

Here’s the mess: OP’s ex-boyfriend cheated on her with multiple women, and one of those women was her sister. OP says she was devastated and talked to her sister about the heartbreak, even while her sister was comforting her and keeping her own involvement hidden. Then the wedding invitation showed up, and OP couldn’t stomach pretending that “everything is fine.”

Now the parents are pushing her to show up, and OP is stuck wondering if skipping the wedding makes her the villain or the only one telling the truth.

Original Post

So I'm (28F) and my sister (25F) is getting married next month. We've always been super close, or at least I thought we were.

Recently, I found out that she slept with my ex-boyfriend from a few years back, right after we broke up. I was devastated by this betrayal and felt like it completely shattered the trust between us.

For background, my ex-boyfriend cheated on me with multiple women, including my sister, which led to our breakup. I confided in her about the pain this caused me, and she comforted me, all the while hiding her involvement with him.

When she sent me the wedding invitation, I was torn. On one hand, I love her and want to support her, but on the other hand, I can't get over the fact that she would do something so hurtful behind my back.

I don't want to attend the wedding and pretend like everything is fine when it's not. I told her that I wouldn't be coming to the wedding because of what I discovered, and she was furious.

She accused me of being selfish and trying to ruin her special day. Our parents are now getting involved, pressuring me to go for the sake of family unity.

So, am I the a*****e for refusing to attend my sister's wedding after finding out she slept with my ex-boyfriend? I honestly don't know if I'm wrong here.

Really need outside perspective.

Comment from u/RainbowDolphin27

Comment from u/GuitarNinja88

Comment from u/CoffeeBeanDreams

Comment from u/TacoTuesday204

Comment from u/SunflowerSeeds77

And if you are wondering how “friends-only” wedding plans can blow up, this AITA about being excluded from the bachelorette party hits close.

Comment from u/LemonadeStandsRock

Comment from u/PurpleDragonfly42

Comment from u/HikingUnderStars

Comment from u/PizzaAndPuppies

Comment from u/MoonlitSerenade

OP’s sister acted like comfort person during the breakup fallout, and that’s why the wedding invite hit like a gut punch.

The moment OP told her she wouldn’t attend, her sister didn’t address the betrayal, she accused OP of trying to ruin the wedding.

While OP is still processing the fact her sister slept with the same ex who cheated on her, the parents jump in to demand “family unity.”

With next month’s wedding looming, OP has to decide whether silence equals peace or just another kind of betrayal.

What's your opinion on this situation? Join the conversation!.

This isn’t just a wedding seat debate, it’s a “who gets to rewrite the past” fight.

Still deciding whether to skip after being cut from the bridal party, read this AITA about a sister excluding her from the wedding.