I have a hard time comprehending that he has nothing to say for himself, or what his reasons are. No clues as to what the issue is? I guess I would have to say to him, "throw me a bone here, this problem affects both of us and I'm getting tired of sitting in the dark". Does he feel that he's already explain the sitch to you , but feels you are not listening to what he is saying? Or is it a case of since he feels that there is no solution (which he can figure out), why bring it out in the open and just rub salt on the open wound?
If I remember right, didn't you do a stint with a C? Was there anything voiced there which can be of any use? The fact that a person who is motivated enough to go out and land the jobs that your H has can not step forward, make some reasonable choices, have a decent dialog and solve this problem.
Your H has me very confused. Perhaps he feels guilty for what he has done, but doesn't want to admit or be held accountable for it. So, if he just ignores it, time will take away some of the "sting" and then make dealing with it not as critical. I guess there is only one person who knows the answers to that and he's not saying much.