I also believe he is emotionally attached to her, but still he doesn't want to distroy his family. I think he feels like being between a rock and a hard place. Actually I feel sorry for him, his life is not easy at all, caught bewteen a wife and a lover, not knowing what to do, I guess he doesn't want to hurt his wife, but he also doesn't want to give up on the other woman.
Many people need diversity in their lives and nobody can prevent them from looking for it. If he breaks up with that woman, he will find another