She's Finally Single! Now, How Do I Win Her Over?

Here's the deal - This girls that I've been interested in for a long time just broke up with the guy she was dating. They dated for about eight or nine months, I think. Anyways, she has become one of my best friends, but I've been interested in dating her for a while now. I told her how I felt around Christmas. She said that she wasn't interested, but she was still with the other guy too. I need to know how to win her over, and I don't want to miss the opportunity.
She's Finally Single! Now, How Do I Win Her Over?
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