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The original was posted on /r/AmItheAsshole by /u/AcanthaceaeOk7563 on 2023-09-24 02:14:08.

Me (24f) and my husband (26m) got married two weeks ago. My brother (23m) introduced me to him because he is the brother of my brother’s then girlfriend (23f).

My brother and my SIL broke up very badly. SIL cheated on him because she had a very toxic relationship with my brother. I am certainly not trying to justify her cheating, I think SIL is absolutely wrong but what happened just happened.

My husband really wanted his sister to be there and SIL’s current boyfriend was also invited to the wedding. I didn’t invite my brother because I thought there might be an argument if he was there.

I told my brother a month ago that he was not invited. We had a lot of fights about it and he has not spoken to me since the wedding. The fights were hard, but somehow I thought we could make up after the wedding, but he blocked me from everywhere. Our parents also tell him that he should talk to me again, but he doesn’t listen to them either.

Yes, it wasn’t nice of me not to invite him, but it was a special day for me and I didn’t want to take the chance of a fight breaking out for no reason. I had no intention of hurting him. If he would just listen to me and let me speak, he would agree with me, but he doesn’t do. He’s my brother, it really hurts me that he doesn’t speak to me. AITA?

Edit: Since everyone is focusing on the cheating, I wanted to explain in more detail. My brother was not 100% innocent about the breakup. He had some friends that my SIL didn’t like because she was jealous of them. One day when they had an argument, my brother met one of his friends to bother SIL. They just had a meal, but SIL counts that as cheating. So then she went cheated on my brother. That’s what I mean by toxic relationship, both of them are not innocent.

Edit 2: I want to say again, I’m definitely not trying to justify SIL’s cheating, and I stood by my brother when it happened.

Secondly, I understand everyone who gave me a YTA. I just ask you to tell me what you think would have been the right thing to do, because if my brother saw her and her new bf, there would definitely have been an argument. They are both childish people