We all do the same things time over time again- we lie, we steal, we cheat and the pattern repeats.
No one's going to learn their lesson because it's not a lesson if you keep going back and doing the same thing. I've recently noticed how some of my friends are going back to the person who treated them badly, the one who actually never cared about them, the ones that's just using you... why would you do that to yourself again and again, just to end up the way you did before? Yeah he made you happy when you were with him, but what about the time when he didn't care about you and about how you were feeling or about how they mentally hurt you so much that you couldn't trust another person for months on end, are you willing to do that to yourself?