Getting mixed signals from a STUNNING girl. What should I do?

I had a big crush on this girl who gave mixed signals. She has a BF in another city, but flirted heavily with me, sent me a postcard from her spring brk, but ignored my dinner invitation only to ask me a week later. I grew sick of the games, so didn't contact her for several weeks. At a party, I was dancing with another girl and she looked jealous. We kinda got talking again, but mixed signals continued. So, I broke off all contact, and 2 months later, I gave in/said hi, and we danced at a party where she was very flirtatious/sensuous on the dance floor, but next day again mixed signals. 2 months later, she called, we hung out, but she flaked out on my plans to meet the next day. I grew sick of it again, 2 months go by again, we run into a party, she gives a BIG hug, we catch up, she reminds me of our dance, says she wants to take cles, but guys think she's interested. I said, don't worry I won't hit on you! and started dancing with other girls. She looked jealous/pissed.