He appears to be a nice guy, but he suffers from alcoholism. It is a progressive disease. It will slowly take over his life, interfering with his ability to work. It will i nterfere with his ability to have quality relationships. It's easy to be nice to strangers. What's hard is maintaining the love between you and your family and close friends.
The pity of all this is exemplified in the movie 'Leaving Los Vegas' starring Nicholas Cage. He has said it was the hardest movie he has made taking a toll acting the part.
Nicolas Cage is So Good in 'Leaving Las Vegas' It’s Scary (filmschoolrejects.com)