Video Game Addiction Support Group
Game addiction is a form of psychological addiction related to a compulsive use of computer and video games. People suffering from this form of addiction may experience intense cravings to play the game and may also suffer symptoms of withdrawal when they stop playing the game. Meet with friendly, supportive people sharing their experiences with Video Game Addiction.
Fighting and nagging him will only make him resent you. The best thing you can do is to detach from his gaming choices and look after you. Maybe better you find someone new who does not have a problem with gaming or other addiction. I found helpful advice at Olganon.org on the forum for spouses and partners of gamers.