He may recognize that something is off w/himself...but I wouldn't speak to his friends about nudging him in the right direction. If he's in MLC, he will not take kindly to others trying to offer up suggestion on seeking out medical and/or professional care. I would hate to see him distance himself from his friends at this time and, of course, if the friends say something to him about it, he will have a pretty good idea that you were the one that asked them to speak to him.
He may not appreciate his friends saying anything to him about what he's feeling at this time. In fact, your h may very deny that anything is wrong. Like addicts and alcoholics, he may very deny that he has a problem and won't appreciate someone talking to him about this. This is something that he has to fix. Remember...you didn't break him, therefore you can't fix him. He has to fix himself and it will be on his timeline, which is extremely slow. The more interference in the processing of the crisis, the longer it will take for him to work those his issues and hopefully come out the other side a more mature, responsible man.
I suggest that you leave this alone for the time being. Don't involve others in trying to nudge him along. I've seen this happen many times and it's backfired. Sit quietly, listen to what he has to say and you can gently ask questions and make suggestions if he should ask for them. This is his journey to figure things out.