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The original was posted on /r/AmItheAsshole by /u/ArchSOw on 2023-08-23 08:26:16.

My(19m) ex(18f) is my sister(18)'s best friend. It was my sister who encouraged her to ask me out and we had a pretty good relationship. But then she cheated on me and slept with a bunch of other guys. Said she only wanted to beat a friend’s record of 55 guys and claimed it didn’t mean anything. I left her and she’s been begging me to take her back ever since. My sister has been bringing her back to my apartment and pestering me to take her back even though I told her not to.

Recently I decided to teach my parakeet to say “You’re a slut, Abby! You’re a slut, Abby!” and having him say that whenever my ex is around. I’m hoping for it to make her stop coming over. My sister is saying it’s distasteful, sexist and unnecessarily petty. I’m now considering kicking my sister out and sending her back to live with our parents.