Do you think I blew my chance with her?

Well this girl sounds like a slut (total honesty). From what I am reading, it seems like her emotions are all jumbled up and she seems confused. But you sound like a jerk when you ignore her. If you really like this girl (it sounds like she may be interested in you and that boyfriend of hers was just a way to make you jealous) then go up to her and start having a real conversation with her. But keep in mind the way she talks. You don't want to date a girl who has no self respect for herself, now do you?