I asked because your post was so passionate, and felt like you were emotionally attached to him.
The best thing we can do for those in this situation is love them ( and yes, a MAN can love another man!) with listening to them vent, gently nudging them to therapy or a 12 step support, and offering to spend time with them to help relieve the isolation and lonliness.
Good luck...hope he comes to al-anon soon!