What is good relationship advice for my situation?

So there is this girl I have been trying to get with and when I asked her out yesterday she said no. What I am trying to figure out is why and what to do next. Just to give you some background information, we practically act like boyfriend and girlfriend already. We hold hands, kiss, have sex, cuddle, exercise together, go on dates, etc. When I asked her out and she said no, I told her I didn't understand what the difference was with what we were doing already and she went into this shpeel about she did not want to fall in love again because she did not want to get hurt and that all the guys she is with end up leaving her after sleeping with her. Then she went on to say that she really does like me. I think her past relationships screwed her up because she had a physically abusive first one and then a cheating second one and loved them both and got her heart broken. She has had a lot of boyfriends but these are the two that she considers serious relationships. She knew I liked her and went on a second date after I told her. She then proceeds to tell me that she wants to be single and that she did not mean to lead me on which is total bullshit. Then she went on to say that she should stop planning things. Then when I tell her I cared about her she started crying. I have not talked to her since and don't know if I should contact her, wait and let things simmer down, forget about it and act like nothing ever happened, face it head on and try and convince her, see what happens, etc. I am really at a loss at how to interpret this and what my next move should be. Any advice? I am stubborn and don't give up easily, especially when I see relationship potential.