Oh, no, concerned. I don't think it's possible to do too much listening.
I can imagine that he hasn't been listened to very much in recent years.....given what you've told us about his situation.
We're all experienced with that "fixing" mode of thinking there is some easy solution for him to get through this if only he/we do X, Y, or Z.......sounds like this is a lot more complicated than that, unfortunately.
Just be his friend, let him talk, offer suggestions if he seems to be looking for them.
And pray, if that's something you do. Tough stuff, this. Hoping he comes through this and can some day look back on it with a shrug and a "lesson learned."