ok so this is a cute nice classy girlfriend type of girl. i met her on friday at a birthday party over in athens. we got drunk, i talked to her a little and shit like that not much...then we went out to the bars and on the way back to the apartment i was kinda joking around with her saying stuff like i thought she was cute and how it's a shame she had a boyfriend. then she fell asleep and left in the morning so we didn't really talk again

then she friended me on facebook like two days later. i accepted and msgd her saying "you were absolutely adorable friday night i don't think i've seen someone throw up with class before"

she is really super adorable and i actually never saw her throw up but our friend was telling me she was classy about it so i tried to throw that in there to offset the compliment. she said stuff like oh how embarrassing and stuff

anyway, what should i do/say next? she does have a boyfriend so its kinda hard. any opinions?

What you have to find out is what she is about. Is that boyfriend serious? Is she attached to him? If you are not in a position to have a chance at getting her for yourself, maybe she only wants attention or a friend, everything else is just fooling around.
It was a mistake acknowledging the boyfriend, and not just plowing through all resistance with attraction and making sure she knows your motives. Because it seems like she doesn't think about you that way.
Be more direct.