How do I help someone with emotional distress and euphoria?

I recently saw a good friend of mine after about 5 years. He was all amped up and acting very strange. He kept talking nonsense, vulgar and inappropriate things. I met him few time after that and found out what was going on with him and why he was acting all weird. His wife and he, high sweet hearts and madly in love are going through some tough time. His wife is having some immigration issues and has been in another country for about a year now. From very little information that he has given me, he is going through emotional distress. I remember him when he was dating his wife and he was madly in love with her. Now it seems that he did not receive what he expected from her in terms of emotional support. I do not know his wife and the situation they have been together in. But it seems that he does not like to talk about that issue or anything related to it. He is also having some issues with family because of his behavior. He seems very rude, arrogant and gets pissed off/ annoyed easily. He spends his days and nights with his worthless friends at bar. He tells me he is very happy in life. Nothing bothers him and gets very excited about nonsense things. I tried to get him into a serious talk but he keeps avoiding it. The only thing I ever got out his mouth that got me thinking was that “people think I’m fine but I’m not”. After this I keep asking him about his wife and the problems they are facing or at least to get him to talk about it. It seems that he is going through some metal distress. He seems to be in the state of euphoria. He also does not express himself. He probably has lot of things in mind, but does not talk to anyone about it. He has been keeping everything within himself. I tried talking to through meetings and phone but he does not cooperate. He gets annoyed and stops talking. He is acting very cold. He used to be an emotional, matured and respected person. It seems he is in an emotional shock and cannot get it out of himself. He does listen to me but it’s very hard to talk to him about anything and is very stubborn. I do not know what to do. He desperately needs help. I want to help him. Please advise.