I don't think this means you're an empath. Anyone can feel a sense of guilt for hurting another person's feelings if they have empathy. But you didn't like how she made you feel. It doesn't make her a "bad" person and you a victim and hurting her feelings doesn't make you a "bad" person and her anything at all.
Maybe she wants you back because she considers you a friend or because she liked you but didn't know how to show it or she just likes having friends. It doesn't have to do with you being an "empath'.