Some signs that things are not going to go well at all, and that you are utterly doomed. (In other words, some very good reason why you don’t have a girlfriend):

1. She is still into her ex, despite the fact that she avoids him at all costs and spends a lot of time with you.
2. She probably isn’t into you, at least not in That Way™, despite the fact that she spends a lot of time with you.

Welcome to the Friend Zone.