Bagheera,
Thanks for your advice. I am not ready to walk out yet. The consequences to my kids are too high. I have reached the point where if I had to do it all over again, I would not marry her. BUT, I did.
That being said, it looks like the carrot is the only option. Unfortunately, at this point I can summon no motivation to do much beyond keeping a good friendship with her. Of course this now has me in the position of being willing to complain to others but not do much about my situation! Sad.