Thanks a lot samsara.
What you wrote makes a lot of sense.

PTSD or not, I know he suffers and I think it's because "he never dealt with his grief properly" as you said.
Leaving for another country to start afresh doesn't mean your problems are solved unfortunately...

Actually I told him I love him and could help him, but if he doesn't want to try and change things, talk about it to get help, then there's nothing I could do.

It's hard but I'll have to accept that...

I guess one day he'll realise he's just not living but kind of "surviving" and he deserves more than that. I hope he'll be truly happy then.

I read your post in the introductions forum and it's helping. I'll keep reading it!
Thanks again.