FT - I don't know if you are religious or not. I would suggest praying for your H and continue treating him with kindness.
If you are so inclined I would tell him that you are praying for him.
In short, there is not much that YOU personally can do. no magic words, no quick fix. Just be there for him and continue to let him know that you are available to talk if he ever feels like it, that you will help him if he needs it without pushing him to do so.
Good luck
BFM
There is only one person who could ever make you happy, and that person is you. David Burns, Intimate Connections