Last night i met this girl in the cafeteria at my res very briefly, basically just introduction then she left back to her room with her friends and some mutual friends of mine and hers. A few minutes later my buddy, who was with this girl at the time texts me to come up and hang out cause this girl wants me, after only just meeting. I went up and within minutes i was hooking up with her.

Shes pretty drunk and she begins telling me how cute i am and that shes been noticing me for a few days now, so its not just the booze thats making her slutty. We hooked up for a while of the course of the night but she had to go home early. The next day i text her and she tells me she has a boyfriend, and says "last night is not how i usually roll."

Now im thinking this shit is pretty messed up cause she told me shes been into me for a while and now all of sudden she tells me she has a boyfriend and shes not down anymore.

Any advice?

Silly girls.
It sounds like this IS "how she rolls," so you just need to push through the next day anti-slut resistance you're encountering. I'd probably play a "I understand...I didn't know you had a boyfriend...no worries" attitude and then just put yourself in the same room as her again. Keep us updated and happy sarging.

id agree tell her you didnt know she had a boyfriend and you feel bad about it and that you wont let it out... mistakes happen kinda thing, but tell her you also thought she was pretty cool and still want to be friends. keep making so its just you and her.