I agree with WCW--he's still wrestling with a lot of guilt. The thing is that you can't be responsible for anyone's hapiness but your own. Show him your love, your grace, your acceptance, and that will be his beacon. He has to deal with what he's done. Would he consider counseling at all?
I guess I wouldn't ask him "how about you?" right now. Just tell him how you feel and invite him into that space without putting him on the spot.