I don't know if this would help, but I'm quite a gamer myself, and from what I know of male gamers, sometimes they are addicted to games to the level that they like the characters as well, and feels like they are part of the wold in the game as much as they are in the reality (or even the worst they think their real wold is in there) have you ever think to take part in that world he claimed so interested in any way. not to become and addict yourself but you know maybe there is a female character from that game that he likes, and you can play a cosplay to attracted him away from that illusion world away and return to you in reality in anyway possible?

(ps: English is not my first language sorry if there is any mistaken words)