You know, that's a hard one, but I think at this point you don't have much to lose. He's still to date saying that he wants to have OW and have you (which is a complete deal breaker), so I'm thinking you don't have much to lose by trying one last time to explain your thoughts with his issues. If you do, just give it a lot of thought about what you want to say and try to keep it from being attcking (which you might have to be very careful about b/c i know there is a lot to accuse him about given your above statement of unresolved issues). Otherwise, he will just feel defensive and nothing will even have a chance to sink in. (I remember reading somewhere about how to make sure you say what you want to say, try writing it one day and then reviewing it again the next). This is definitely going to be hard on S no matter what, so addressing with H the potential issues needs to happen at somepoint. (Unfortunately with our selffish H's, our S's which should be their 1st priorty, are not). If H is going to be too clouded over from your statements about OW, you might want to hold off and have a separation in person conversation the deals specifically with S. That way, hopefully, you can stay on track with that issue and find a resolvution to make any transitions as easy as possible on S.
I hear you about S being the bright spot. Sometimes I just wish I had never met H and then definitely not married him, but then without him, I too would not have my wonderful S. I guess sometimes we take the good with the bad.
Me 27; H 28; S 2 Togeth 9; M 4 Sep 11/14/08 EA OW1 Sep 08 EA OW2 Mar 09 EA OW3 Jun 10