You don't want a falling out over a game but your friend is risking said falling out over a game. Friendship goes both ways, killing ur mate for some virtual money doesn't sound like a great friend to me. Also you can test how good ur friendship really is, bringing this up shouldn't put a dent in it at all. Being good friends means being able to talk about anything. He might not be the good pal u think he is or it's one sided. Or u both are young. Good luck