Do you miss your ex-Girlfriend?
I know you do, otherwise why would you be here? You miss Her, and you should. She was special, wasn't She? One of a kind? Boy, you sure were lucky to have a girl like that in your life, and now She's gone.
Forever.
But you can't get over that, can you? Day after day, night after night, you think about Her. Things you did together. Things you were going to do together. The promises you made, the promises She broke. You think about how things could have gone differently, and what you'd say to get Her back if you ever got the chance.
She consumes you. She's all you can think about, and there's nothing you can do to stop it.
...but would you even want to if you could?