I agree with the posters that trying to talk to him would be a start. Also is there another activity that you like that you could do while he's playing? Maybe he would be willing to make one night a "date" night, or a friend night (pizza, movie, popcorn type of thing.) Do you both play cards or board games? It's kind of hard to work with someone who's really into something.
I have an adult son who is into these kinds of games - it would be his whole life if given the opportunity. We finally got him to get a part-time job (he's got a disability, so more time on his hands.) We told him he has got to get out more with other people and activities or he's going to be a lonesome person. I'd hate to see him married right now - she would have to stay on him or give in and play his games all of the time.
I hope things get better for you.