Basically, if she does want to actually be with you, she'd have spent time with you at that party, and not gone slagging off with everything with a pulse. I didn't understand your post really, seemed a bit all over the place? One minute you're saying she doesn't want you, then you got with her mate, then you felt bad, and she got pissy with you? If that's right, the wtf? Sounds like she's messing you about. Ask her why she's going off with everyone else, and blanking you out? Even before you got with her mate, you hadn't done anything wrong...?