Don't forget that most of us go through stages of 'grief' even if you're a caregiver. A couple of the stages include disbelief and anger. It's o.k. and usually resolves after a time. Also, some folks (like me) don't want to go to a councellor but prefer to read self help articles and books.
I'd say to allow him his times and remember not to take it personally. He's not angry with you, just the circumstances you guys are in.
My best ,
Cyndy