[Vautrin]

First of all, anyone who plays head games, is not worth much thought, nor consideration. It could have ended up much worse, in it that you would have become a couple with that girl. Be glad that it did not happen. Imagine that, for a while. You would have ended up much worse.
I had it happen to me that a girl played head games, but overcame my outright frustrating experiences. A year later, fate smiled down on me.

Second of all, it is not the only thing that happened in your life. You have overcome many hard situations, and there is no reason to let your life be defined by outside events, even though they have been terribly hurtful. You are better than that, DA; you are more than the sum of past events.

I realize that change is hard to accomplish. There is some truth in the thought that happiness is a habit. In short: if you do things of which you believe that they make you happy, you will become happier.
It is hard to change thought processes, as you well know. But don't focus your thoughts on past events, especially the hurtful ones. Think of the the present, think of the future.