I had something like this happen to me a few days ago. I took it to mean one of a few things:
1. She actually hates me and was only pretending to be on good terms with me because she's paranoid about crazy guys/too cowardly to say no.
2. I'm worth less than trash to her and she found a replacement
3. She wanted me to strike while the iron was hot and got salty that I didn't move fast enough or something like that.
In any case, she's probably a psycho b!tch and you don't want anything to do with her anyway, figure out what you did wrong so you don't do it again next time but don't lose sleep over some woman who treats men like toys to use, play with and throw away.