Instead of trying to be a psychologist, try to be what you are, a friend. Sure, he might need a psychologist, find one for him and if he ask help, then give him the name, phone number... hell, you should even stay by him when he will call that number and support his decision.
Friends are there to support you, and do activities with you. Right now, I think your not going anywhere by confronting him and bashing on the thing he love... imagine this : If he had a girlfriend and he would do stuff with her 18 hours a day, and you would tell him: "it's bad for you, I don't know you anymore", don't you think he would have the same reaction as with his game ?
Why not try to play the game with him... you will be sharing something together, and he will probably be really enthusiastic about you joining his Pirate friends. Maybe then, you will be able to have a discussion with him whitout him getting angry.
By showing him that you can play without being addicted, that you can accomplish all your other task while not playing 18 hours a day... then he might consider doing the same. Right now, he might only feel isolated and missunderstood.
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Instead of trying to be a psychologist, try to be what you are, a friend. Sure, he might need a psychologist, find one for him and if he ask help, then give him the name, phone number... hell, you should even stay by him when he will call that number and support his decision. Friends are there to support you, and do activities with you. Right now, I think your not going anywhere by confronting him and bashing on the thing he love... imagine this : If he had a girlfriend and he would do stuff with her 18 hours a day, and you would tell him: "it's bad for you, I don't know you anymore", don't you think he would have the same reaction as with his game ? Why not try to play the game with him... you will be sharing something together, and he will probably be really enthusiastic about you joining his Pirate friends. Maybe then, you will be able to have a discussion with him whitout him getting angry. By showing him that you can play without being addicted, that you can accomplish all your other task while not playing 18 hours a day... then he might consider doing the same. Right now, he might only feel isolated and missunderstood.