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The original was posted on /r/AmItheAsshole by /u/Laylapaloozaa on 2023-09-21 13:07:22.
I (23) have been dating my boyfriend Nick (25) for 4 years now. He had been coming to me and my sister's shared apartment more than I could even see my sister. He lived across the hall from us and we immediately clicked and started dating.
My sister, Jessica (25), loves to party and is barely home since we moved out of our parents house. She had been bringing people to our shared apartment without my consent which infuriated me, I have been paying for the rent and she did not contribute one cent because she could not get a job so the ones paying up for her were our parents. We have not been close ever since we were young. She had always been the favored child and all I get were her hand-me-downs. When I decided to move out, my parents begged me to bring her with me. They said she'd learn indepence when I live with her, with a heavy heart I decided to agree.
Everything went downhill when covid started and Jessica was forced to not leave the apartment due to our apartments strict health policy. Me and my boyfriend started seeing her more and she did not hesitate to make it obvious she was jealous of our relationship. So she started asking my boyfriend to treat her like how I got treated because he needs to 'get the approval of his future SIL.' and my boyfriend being the nice man that he is he also started cooking food for my sister, sometimes doing her laundry when I was too busy doing my work and basically also treating her as if he was her butler. I told him he could refuse but he just always tells me he needs to get on the good side of my family. And in no time, I know my sister had started falling for my boyfriend. She also had started becoming very touchy and clingy to my boyfriend. He soon had started to give her the cold shoulder to show her he's not interested. My sister would throw tantrums and call it unfair that I get to be treated like a princess and she doesn't.
My parents started blowing up my phone to tell me that I need to break up with my boyfriend because it's ruining my relationship with my sister. I told them that they should stop taking her side and she needs to stop acting like a child. They bargained with letting me stay with my boyfriend but he needs to treat my sister like a girlfriend as well which made me mad. I dropped the phone on them and confronted my sister. She said, and I quote, "maybe it's time for you to pay me back on all the things I gave to you when we were children." Meaning all the broken hand-me-downs that I received because my parents could not afford to buy me new stuff to keep up with HER lifestyle. I kicked her out and my parents had been threatening to disown me and have me 'refund' for the rent they have been paying for my sister's behalf if I don't patch things up with her and how dare I let my boyfriend ruin our family. I just ended up blocking them all. AITA?