Need some relationship help!

hey yall.

I am in need of some help. Here is the story:

I was dating this girl for over a year. We had a kick ass relationship for about 7 months... then an old bf ofhers came back (they never had total closure), and some sparks flew. So I tried for awhile to bring her back from the dark side. Well after awhile I was tired of hearing 'I'lll do this and I'll do that'. It was just a bunch of talk. So by the time she came back around and booted the guy (they didnt date or anything). Then she came back and was ready to start over.

Well by this time I was not where I was and had lost my feelings. I told her I didnt have the spark I needed and stuff. There was crying and stuff.. But you cant help the way you feel.

Well we both agreed that it was time to start dating again. I told her it wasnt healthy for her to wait around for me to come around. Well the other night she met a guy. Which I guess in a way is good for her. But for me, I am having a hard time dealing with it.

My love life has been totally sucky lately. Every girl whom I have tried to hook up with as just not worked for one reason or another. I have started to take it as a hint that maybe I am supposed to be with my ex. She is a great girl and has changed her evil ways, and has proven it.

The thing I am trying to battle is. (and right now I have a pain in my stomach). I cant tell if its just jealousy. Or if what I am doing right now (trying to find something differant) is the right thing to do or not. I am trying to figure out if what is infront of me is what I am looking for and I am just to blind to see it. And if I leave this alone if I am making a big mistake?????

I am going to her house to talk to her tonght. I dont have a lot of time on this. I have a small window here and have to think fast on what I want to do.

Any ideas?

(PS - Sorry this is so long )