Why do girls send mixed signals?

There's this girl I have a crush on, who has a BF in a diff city, but flirted with me heavily in the beginning- had an innocent mischevious way of talking & she even asked me to have drinks/dinner with her (in return for my help with career advice). But then she turned cold, I contacted her and asked her to... show more There's this girl I have a crush on, who has a BF in a diff city, but flirted with me heavily in the beginning- had an innocent mischevious way of talking & she even asked me to have drinks/dinner with her (in return for my help with career advice). But then she turned cold, I contacted her and asked her to dinner, but she didn't even reply to my email. I confronted her a week later, and basically told her that I was at least expecting a reply, ignored her for 2 weeks. Then, she asked me to dinner, and I refused thinking she's just playing games. Since then, she has been visibly jealous when she sees me dancing with other girls at parties, but this one time, she asked me to dance with her, we got very sensual on the dance flr and she said "I want to get to know you". But at dinner the next day, she starts talking about her BF and acted aloof. I got sick of it & didn't contact her, but she called me again after months and again, mixed signals. Why is a girl with BF sending mixed signs?
Update: I ran into her at another party several weeks ago and she came up, gave me a hug, was very friendly, but also started talking about her BF again. Then, when she saw me dancing with other girls, she asked why I hadn't contacted her in months and looked pissed. I think she's a player, so I haven't... show more I ran into her at another party several weeks ago and she came up, gave me a hug, was very friendly, but also started talking about her BF again. Then, when she saw me dancing with other girls, she asked why I hadn't contacted her in months and looked pissed. I think she's a player, so I haven't contacted her after that at all, and she hasn't either. I don't understand why a girl with a BF would send me mixed signals.
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