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The original was posted on /r/AmItheAsshole by /u/Strawberry-kerry on 2023-10-04 23:36:24.

In the beginning of this summer my sister (F39) called me (F38) crying telling me that her husband (M33) of 7 years as married 13 years together, 1 child, had an affair. This came as a completely shock because up until then I always saw him as one of the nicest guys and during their whole relationship he’s the one “winning the lottery” I’m not saying that just because she’s my sister but because she really did the wife effect on him. From being this overweight gamer with no ambition in life, to this fit guy with a degree and a great job now. During his whole education she supported him and thanks to her he could study but still living a very high maintain life with restaurant dinners and vacations. They bought an house, had a wedding in Italy and just recently bought a Porsche. They also one of the greatest kid in the world, my nephew who I love more then anything. She has giving him everything and during their whole relationship me and my boyfriend have been hanging out with them. My boyfriend and him are really good friends and even hang out sometimes in their own. So when she called me and told me she caught him cheating and had a f-king affair for three months my heart broke for her and I felt such a rage towards him for hurting my sister. Despite this my sister decided to forgive and stay with him. Which we got into in an argument about. But it’s her decision so I’ll support her in any way I can, especially since she’s putting my nephew first and before herself. But now after a couple of months both my sister and my boyfriend wants us to start hanging out again. I feel though Im still mad at him and that in general don’t like him anymore and therefor don’t want to hang out. Both my sister and boyfriend thinks I’m being a bit unreasonable. AITA?