oh brother where art thou

I have a friend who refers to me as his brother from another mother. One Sunday while he was out to dinner with his wife he got up and left. And we haven't seen him since. He did call his mother some time later to let her know he was OK. He does not have his phone with him so I can't reach him that way. I have sent him a couple emails, but no reply. I really want to talk to him. Maybe I can help him sort things out. Time will tell.