I don't have any adivie for you but I do remember reading in Conways's book, Men in Midlife Crisis, that it is very hard for the men to disengage from the affair. They have a hard time huting the OW for some dumb reason. They sure don't have a hard time hurting their wives. but anyway, my point is that this is probably not usch unusual behavior. Maybe if, with your c, you talk about that issue directly (why it is difficult for him to leave her) you may be able to get him past it so that he can make the break.
