How long, have you been separated? Sometimes, when it's a fresh break up, it's easy to try and figure out what went wrong, where are they now, and be a little put out, by the ease they portray in moving on.

At some point, letting go of wanting to know what she's been up to, is important, because right now, focusing on her and the past, you aren't freeing yourself up, to become involved with anyone else. Leaving you, emotionally unavailable to others that may come your way.

Hope you are able to look objectively at what was, what isn't going to be, what worked, what didn't work so that you can move to the next relationship that comes along.