Ok so full story is that me and this girl, lets call her Sarah, are friends. Sarah was a senior in undergrad at the time and I was a freshmen. She was also my carpool home when I went back home every couple months. So basically we started hanging out alone, ya know like doing homework together or smoking some trees so I got to know her but she never told me about her bf. I heard about him through mutual friends but i never asked Sarah about him cause I just didn't really care honestly.

Fast forward couple months and she invites me to her Xmas party in December and my friends and all go to her house and it was a fun time. In the middle she comes to me (blackout drunk) and asks me where her car keys are (I used her car to drop a friend back home cause she was not feeling well) and I told her that when I got back I gave them to her. By the way I should mention that this night I did not drink much (couple beers after I got back from dropping my friend off), not sure why, but I was basically sober the entire night. Anyways so I tell her that she has them and then she takes my hand and brings me to her room where she's like "I can't find them!".. I tell her I mean i don't know where you put them and then she just makes the first move and pushes me against the wall and gets really close to me. Me being a freshmen and seeing this happening with a senior whose pretty attractive I obviously don't back away and I let it happen.. Before we could do anything else someone opened her bedroom door and saw us. After her friends came in and saw us I left and went back to the living room where everyone else was.

The next morning I told her what happened and she did not believe me as she didn't remember. She asked her roommates and they told her that they saw us on her bed which is true and people did see us. She then tells me not to tell anymore people and I never talked to her again. I tried following up the next day but she had blocked me on every social media platform and I never talked to her again till this day. I have seen her at tailgates or day drinks a couple times since but now she is in Grad school.

Another detail is that she was dating this guy (Alumni) who was the founder for this fraternity at my university and i knew every brother in that fraternity and went to their parties as 99% of my friends all went there almost every weekend. Turns out I later got banned from their partys and events partially because of this.. Not a big deal but it kind of sucks cause i am friends with the same ppl (not the brothers though) and they sometimes go out without me leaving me with nothing to do some weekends. AITA

TL;DR: I was sober and consciously madeout with a girl who made all the moves on me but I did know she was dating someone which led to me being banned from a fraternity.. AITA