He sounds very depressed. Sorry you have to keep dealing with that. Please know you cannot fix it. For me, I used to sort of badger my H - What's wrong? Tell me what's wrong? On and on. It aggravated him to death and the more I asked the less he talked. I would 180 that. Seriously. I think Michele even discusses a similar situation in the book.
Also, maybe encourage some hobbies. My H would be much better if he had something he enjoyed and could immerse himself in. Walks are good too. :-)
