Angst and confusion with friend's X

I think I’m in love with my best friend’s ex (F and X); they were together for 2 years but split about a year ago. Last friday I met her at a farewell party that turned out to be for her present bf. I was doped as ****, paranoid withdrawn —the freak of the party—, yet all night she stayed next to me talking, dancing, joking, drinking, etc. She would briefly go to her bf’s group but then return. The following day I felt like ****, as if my heart had been sucked off and crushed by a steamroller… so I realised this **** was deeper that I thought! Anyways, my friend F told me that she is not going after his bf, so she is soon to be single. This made me rethink that night: could she had been “throwing” signals at me?

When she was engaged with F she would stare at me, get very close to me in conversation, laugh at my jokes, show admiration, etc. All this in plain sight of my friend, who was visibly uncomfortable. Some would consider her attitude as disrespectful: for instance, one time while tripping balls she asked a mutual friend to tell me that she loved me… again in front of F (love is a big word around here, though it may have been just gratitude, as I provided the acid and it was her first time). Needless to say this was all very painful, but I eventually resolved to make some subtle advances to test her reaction… and she ignored them.

I know, it all sounds like your typical case of friend zoning and/or that she’s a bitch, but she’s not. I'm hooked to her, and I can feel she has a strong affinity to me. What are your opinions? FORGET HER? MAKE A MOVE?