I need some advice with this one girl.?

Well, I know this girl and we used to be pretty good friends a few years back. then we kinda just stopped talking. then this year we started talking again but her boyfriend was afraid that shed fall for me or something nd he didnt want us talking. Im good friends with the bf and still am and i respected what he wanted because i can understand something like that happening so i backed off. now they broke up becuase of a bunch of **** happening and it was deffinately mutual. Now we talk a lot again. Now you need to understand i am not usually a hapy guy but now whenever i talk to her or chill with her im happy like idky anything couldve happened to me before we talk then i talk to her andim happy. and things she says make me smile that normally wouldnt. shes smart,beautiful,hot,has a hilarious sense of humor, is nice, understanding, a good listener, all that. i just need to know if i may be in love with her or is it just a phase in our friendshi or something? and what shouldi do?