>>1
That sounds bad. I don't really know what I would do in such a situation, but here are at least a few suggestions.

Try to keep in contact with him. Be it by phone or chat or whatever just try to talk to him. If you know each other really well, that may help him a lot.

If it's getting really bad, he should probably get professional help from a Psychologist, if that's possible. I heard that they can help a lot with lacking social skills and depression.

>>2
Trolling is not an option. Please go away.