So - I get that you need to sell the house. But what's stopping you from booting him out to live on a friend's couch or cheap rented room? Wouldn't that be cheaper in the long run than all this aggravation? Check with an attorney, but it seems pretty likely that he'd still have to contribute something to the house maintenance meantime until it sold.
Even if it drives him to stay with OW - wouldn't that hasten their demise, as you've so often said?
