Hi "Blues" ~ I applaud you for wanting to help him. But the trouble is, there is not much you can do. About all you can do is LISTEN -- let him talk, and get out whatever it is that is bothering him.
Keep advising him to go to therapy and talk to the counselor. He needs therapy -- that's the most important thing.
Other than that, you can just listen and basically agree with what the therapist told him, assuming he tells you what the therapist said. Be supportive.
That's the trouble with a long-distance relationship. You can't do much and to be perfectly honest, I haven't seen too many long-distance relationships flourish. They usually end at some point or another due to the distance.
I wish you the very best. God bless and keep us posted. Hugs, Lee