Another possibility is that she wants you for emotional support. While you two were together, you were probably quite caring for her and sensitive for her feelings. So right now, by keeping you around she is basically using you as a way to secure herself.

My advice is that if she says you two are friends, do not commit more than a friend. Go for other girls out there. If she does like you in the end rather than just keeping you for security, she will eventually come back assuming everything is right. If she doesn't, well that's fine, you two are friends anyways, and you can keep going for other girls.