A.
I'd try to approach him at a time when you're both relaxed and have time to talk, and use the simple (hard to do, but helpful) approaches in "men are from mars, women are from venus". It seems silly, but the book does have some helpful ideas. If there's any way he'd read it, too, that would be great. It is entirely possible that he has some mild depression, but whatever is going on, it has to change. You'll become more and more resentful, and you'll grow apart from one another if you don't start doing things together. I think marital counseling would be the best thing here. Good luck, and remember, marriage should be a partnership- and it can be again!