well, most girls will be pretty obvious about it. but i'm kinda the opposite. if a girl has commitment problems then she will act like i do.
every time i am around a guy that i feel a really good connection with, i kind of shy away. not shy like nervous but shy like trying to not get involved. i dont know what it is but the only guys i ever flirt with are ones that i would have absolutely NO future with, and the ones i would have a future with i kinda freak out about.
i know this doesn't help at all...i really don't know why i said anything at all. im just screwed up is all. good luck!
if you want to be sure, just ask her. she will either say no and you can just be friends, or she will say yes and life will be awesome. risk is fun, try it occasionally. from the words of risky business "sometimes you just gotta say: "F**** it!" and just do what you want"