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The original was posted on /r/AmItheAsshole by /u/WiseAcanthisitta4 on 2023-09-14 07:48:12.

Two months ago, my sister’s husband (30M) came home and asked for a divorce. She spent a couple weeks with my parents and then moved into her own apartment. Within days (literally) of him breaking the news, she had found a new casual boyfriend (34M) and has been spending more days with him than not.

I’m very happy for her. I don’t want her to be alone. But the problem is that she is continuing to routinely get dinners with her estranged husband and she’s told my mom she thinks he wants to get back together, but she’s not certain. My sister said flat out that if the husband wants to start over, she will ditch the boyfriend.

My son is turning 5 next month and we are doing a family birthday. I feel really bad for this guy my sister has been dating. And I know from personal experience that the sting of losing a relationship is worse the more involved you get. I told her that she is welcome to come to the party, but not the boyfriend unless she’s serious about him. She was mildly upset. I feel like I’m being controlling, but I also feel bad for this guy at a “bro” level and I don’t want to encourage what she’s doing.

AITA for not allowing her to bring her rebound?

TL;DR: My newly-separated sister wants to bring her new boyfriend to my son’s birthday party (mostly family). She’s also still seeing her estranged husband and they’re trying to work things out. I told her that it’s wrong to involve someone in family events if you’re planning on breaking up anyway. She’s upset.