But I'm also thinking that she came back before so maybe she will again.
you know why people "come back" again?
because we allow them to.
you allow her back in your life because the pain of being with her, is easier than the pain of being without her.
the problem is, when we choose the lesser pain and play it "safe", we give our power away to someone else.
when choosing which pain to suffer from, try picking the one that leads to you having possession of your power.