Sounds like your h is ready to run back home to mom and dad. Now, does this sound like a mature adult? Nope, sounds more like a teenager homesick at boarding school wanting to return to the fold.
His father definitely gave him something to think about. Whether it sinks in or not is the question of the day.
It will resolve when he's ready to face his issues. He's still in replay and that stage takes a very long time. I do think he left the letter open on his screen hoping that you will see it and comment about it. I wouldn't say one word, i.e., let him bring it up.
Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
