My fiance keep a picture of his ex in his wallet?

[mammothplantation890]

My fiance keeps a picture from a high school dance in his wallet. It's of him kissing his ex of 9 years who ended up cheating on him and they're with his best friend who died when they were 18 (would have been 32 now). I haven't really been bothered by it until now.
1) He has other pics of his deceased friend that he could get reprinted into wallet size.
2) He doesn't keep a photo of us or me in his wallet. It's super trivial, but he's also never included me in any of his Facebook profile pictures.
3) His ex shares a lot of the same friends as us, and I'm tired of her constantly being thrown in my face.

We have a really good relationship and I know he loves me, but am I being crazy? The fact that he's kissing her in it is what I really can't get over. One time when he thought he lost his wallet, the only thing he cared about was losing the picture.