Is AUTHOR wrong in the post ? POST : Going to try to shorten this, but basically I've (24 F) had a crush on this guy in one of my classes (24 M) for a while now. Turns out one of my acquaintances (22 F) (we're in the same major and we've taken multiple classes together but I don't know her out of class and for some reason I've always got the vibe she doesn't like me) was interested in this same guy. He would always try to talk to me and flirt with me and help me with projects in class but he seemed really shy and I was hesitant to ask for his number because I'm fresh out of a long term relationship that ended last fall. So this girl starts to hang around him a lot more, obviously was into him and would interject herself in our conversations. Then one day she asks if he wants to go to lunch in front of me. He says sure. 

I noticed them hang out a couple times afterwards on campus. and honestly I'm not sure if this makes me the asshole but I'm really into this guy so I decide I probably need to make a move at this point and speak up. So I find him on instagram and ask for his number. He asks if I want to hang out some time and then asked if I wanted to go to dinner the next night so we go and hit it off, everything's going great. We coincidentally run into her leaving and she just says "oh okay" passive aggressively and then walks off when she sees us. He says that they hung out literally couple of times but he wasn't interested in her. 

She confronts me the next day in class and says that she sees what kind of person I am and that I knew she was talking to him and called me a "fucking bitch" when she walks away. I'm such an unconfrontational person so it was beyond uncomfortable. 

TLDR: Me and acquaintance/girl I know from classes liked the same guy in our class. She asked him to lunch first, hung out with him a couple of times. I ask for his number and we go to dinner. She confronts me and calls me a bitch. AITA?