It's been 10 years since my (ex) husband left me and our 3 year old son for another woman stating we or more specifically our son wasn't enough for him, he wanted more. Numerous girlfriends/wives down the line he is now having another child, I can't express the hatred that is consuming me, our son was not enough for him yet he is a bright, intelligent, thoughtful boy but I feel pity when I look him in the eye.
I think you may need counselling if you still feel this level of anger 10 years on.
What kind of a relationship does he have with his Dad now? I tell my DS ( who doesn't see his Dad) that he is lucky he has one parent who loves him so much and that isn't what happens in all 2 parent families..Did you watch 15,000 kids and counting..have a look on 4 on demand if you didn't ..he may not have the perfect dream family but in reality there is very few that it is the complete dream.