I'd say talk to him and ask if that is what he really wants. In a nice non threatening way.
A D is not the end of the road, necessarily. What do you think will get you closer to your ultimate goal (a new and improved R with your H) if he tells you he does want it?
"You don't throw a whole life away just 'cause it's banged up a little"
Tom Smith in "Seabiscuit"
