[AnthonyMalibu]

The poster who mentioned the "grass is greener" analogy is correct, and that's exactly what happened. But I'm pretty sure you're not trying to explore why she came back, or whether or not things will work out... what you're looking to know is HOW to get over the thoughts of your girlfriend being with someone else.

First things first: you cannot fixate on this other guy. If you're asking for details about your girlfriend's fling, you might be trying to picture in your mind... thinking this will help you get past it. It won't. In fact, it might make things worse for you.

The less she tells you the better, and the less you bring it up, the happier you'll be. Still, you're going to feel some measure of pain at the fact that someone else "had" your girlfriend.

To get over this, I want you to do something a little different. Close your eyes, and picture all the girls you've been with. Remember each of them in your mind. Count them up... and try to sum up all the fun you had with them, both in bed and out.

Now take all that experience and compare it against your ex's 2 month fling. In retrospect, her experience with this guy means nothing. Just as all the girls you've been with mean nothing now as well. These are just two separate paths that the two of you took, that brought you to the point where you're at right now.

Instead of fixating on this one little rebound relationship she had with this guy, look at the sum of everything each of you has done. The fact that you're together now should be the only thing that matters. Let bygones by bygones, and forget about what happened. The future is important, not the past.