Its simple. you either want what you don't have, you realized you never knew what you had till it was gone, or all of the above. you also may feel that because e moved on so quickly that maybe you weren't as important as you thought. you have then two choices - option A. try and fix things/get him back (or) option B. move on with your life. obviously you already know that or you wouldn't have posted this question. so think objectively and don't look for people to back your choices. think without pride or ego and ask your self with an abstract view to why you feel jealous? I'm not here to bust balls. Just asking you to think past things like looks and self esteem, and realize that some men are built that way. (me included) I got dumped and moved on in less than twenty-four hours. doesn't mean I didn't care about her, in fact I loved her and still do to this day. I just saw no use In wasting time crying about it. If you don't want him, and he's happy; than I really see no problem here. you will spend time dwelling over it, that's a given. but understand there is really nothing you can do in this current situation, and if you choose in-action then I recommend you leave it, keep in mind the only reason he's in another girls arms is because you led him there. being jealous ain't gonna change a damn thing. you are upset because you lost in the end.