My contribution in this would be that there are basically two types of guys -- ones who are loyal and ones always on the hunt.
This is a great discussion, thank you for bringing it up CG! I too have wondered about that as I have read these threads.
It is sad to me to realize the truth of which type of man my STBXH is, and always has been. He may not have always been on the hunt for another woman, that only came recently, but as I think about our life together, he was always on the hunt for something. He was not happy within himself, and has always looked for something outside himself to fix that. I don't want a man like that in my life... because until he deals with that... the hunt will never end, I would continue to be pushed aside in the ongoing need to hunt.