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The original was posted on /r/aitah by /u/throwawayAITA-SISTER on 2023-10-07 01:39:18.

I just want to come here and update everyone that I have told my BIL about the affair.

I have read all your comments and thank you very much for the insight. I had to do what would make me sleep at night. I love my sister but she must’ve known that I couldn’t just live with the guilt. I have been cheated on by someone I loved and I know how shitty and selfish you must be to cheat. I also know that if I could do it again, I would want to know this time too because while the pain was enormous, I still feel lucky now that I found out.

My sister has called me like 20 times but I didn’t answer. She texted me,

“Do you feel better right now? How could you do this to me? I loved you, you ruined my life”

I didn’t answer her. I wanted to answer her that she was the one who ruined her life but I didn’t answer her. My parents are shocked and angry but not with me. BIL called and told them everything and he talked about plans that maybe my sister and he will move back to his hometown. He is devastated and broken. I hope they can move on from this together or separately, it doesn’t matter. But that they move on and find real happiness and not at the cost of other people like it is now