Wow, I am sorry to hear that. Sounds to me like he's a little more than a casual player tho...casual players know the game is a game, play when they actually have time to play, when it doesn't interfere with anything else, and know that RL is much more important than the game. He's become hard core, sorry to say.
I really don't see any other way then to talk with him about it. Gambling, drugs, smoking, gaming...all addictions, and sometimes peeps need an intervention to see what they are doing to themselves, family, and friends.
GL!