IF anything happens to make him think, it will be very far down the road. This is all VERY new.
You've got to back off. You've got to quit trying to make H "get it." You ARE expecting miracles, and they aren't going to happen. Back off. Back off. Back off. Focus ONLY on how to handle the S/D with DD. Do not try to get C to ask probing questions. Be uninterested in what is going on with H or with what is motivating him. Don't try to make the C see that H is crazy. Back off, back off, back off. You are WAAAYYYYYY too desperate and needy for H to even begin questioning his actions, you have got to accept where he is now, validate his feelings, and give him WAY MORE SPACE than he wants.
It will take time, and space. Get your focus off of H. Your actions should be independent of H.