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The original was posted on /r/AmItheAsshole by /u/Hefty_Manufacturer_9 on 2023-06-21 15:03:08+00:00.

i(21f) recently moved in w my older sister(25f). i did not know she was seriously dating anyone before but meet her bf(?m)when moving in. this is my first time living anywhere besides our moms house so was excited to be able to walk around my own house in any state i choose when alone. the only mode of transportation that the bf uses is my sisters car so when she leaves the house so does he. or so i thought. on one other occasion he was still at the house after my sister left & i was not aware. after this i asked that my sister let me know if he would be at the house when she is not. in a rush today she forgot to tell me, & i realized he was here when i hear a door close in the house after she left. i knocked on her bedroom door & when he answered i said out loud “why are you still here” exasperatedly. like 15 mins later i heard him leave the house & he didnt say anything but i think he already has an opinion abt my attitude bc of an incident when moving in so i think he might have been offended. aita? EDIT: I SHOULD HAVE CLARIFIED WE MOVED INTO A NEW PLACE TOGETHER, IT IS NOT MINE OR MY SISTERS HOUSE BUT BLTH OUR EQUALLY