Oh boy...

Well one thing I can tell you is that jealousy is one of the hardest emotions to overcome.

You need to realize this man has a child with this woman. She will always be in his life one way or another. You can chose to accept that now or later, and trust me now is a lot harder than later....

If I had to take a guess I would really assume that you are reading way too deeply into the whole "he looks closer to her in pictures than he does with me" thing. That assumption you have is most likely due to your jealousy towards this person. If you did not feel jealous I am positive that is not even something you would have noticed in the photo. You probably "look" for little things here and there than can set you off, after all that is one of the many things that comes with being jealous.

After you really accept, and I mean REALLY accept the fact that he is with YOU now. He is NOT with her, he is with YOU. This is for a reason. They didn't stay together for a reason. There is no reason for you to feel threatened by past photos of them together. You also have to realize that he refers to her as his ex-wife because of the fact that they were engaged! It is a lot easier than to say "my ex-fiance..." Ex-wife sounds more reasonable for the mother of his child especially since they were engaged at one point.

She is not a threat to you. He is not with her anymore. He did not love her more than he loves you otherwise he'd still be with her. The only thing he may feel passionately about is the fact that she mothered his child.

Try not to over think things too much.