If you decide to move on, best thing is to do it and recover. Get on with your life. Preserve you sanity and morals. Realize that this is his mess. He may work it out. Probably won't. I think there are more avenues - like the internet - in which people can feed their delusions. I mean think about it: How could any "normal" person enage in an intimate relationship with someone they can't even see? Liars on both ends of the exchange. Then there's the fact that they're married.

I don't think these people can be fixed. It's to easy to continue the silliness. My wife graduated from the internet sex/relationships to the telephone and then to match.com.