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The original was posted on /r/AmItheAsshole by /u/Other_Armadillo_8617 on 2023-10-06 18:18:52.
My ex and I got divorced 4 years ago because he cheated on me. We have a 7yo son together. He is going through some kind of midlife crisis I guess and keeps dating different women. His new toy is a young girl in her early 20s and he seems to be serious about her. They got engaged a few months ago.
A few days ago when it was my custody time my son was invited to my ex MIL's home for her birthday. When it was time to go after my son and bring him back home my ex MIL insisted I go in and eat some cake and I agreed.
My ex's new toy was there and talking to my ex SIL. She asked her how many kids she is planning to have and she answered that she has always wanted 2 kids and since she already has a son she just wants one more, hopefully a girl.
News flash, she doesn't have any kids. She was talking about my kid. I told her to never refer to my son as hers again and reminded her that she doesn't have a child and my son is only mine. She called me a crazy bitch and asked me if I'm about to leave soon. I took my son and left