This is my guess. I could be wrong.... but I think it may be that his ego is boosted by having lots of women desiring him, and ultimately that's something he doesn't want to lose. There's probably a part of him that likes the idea of a family and the new baby seems like an "exciting new thing," but the reality of a family and marriage may be too much for him. I don't think he really wants it. If he did he would remarry (no excuses) and completely devote himself to his family and refuse any OW's phone calls (regardless of what disasters are occuring in their lives). He is a divorced and single guy, and seems to be happy with that.
There is no arriving, ever. It is all a continual becoming.