Sooo does she like me?

Well I use to fancy this girl(Jess) I mean i was totally infatuated with her. I loved her. I told her i fancied her and then she ended up going out with this boy, and I was pretty depressed about it When I told her,she was fine with everything. I was expecting her to totally freak out and never come near me again. But we still were friends about a few weeks ago I told her that I didn't fancy her anymore. But now i'm kinda curious cause i think she fancies me. She keeps staring at me and stuff and the other day she came right up close to me face as if she's about to kiss me. But then her boyfriend was there and she did it too him after sooo i thought whatever. I found out i still like her but is she intrested in me? Although she does claim that she is straight soo yeah i dunno what to do. How do I know if she DOES like me? What are the signs?