How can I get my boyfriend to stop playing d&d?

my boyfriend plays d&d. I don't like the game and I could ignore it if it was just a hobby. but he's obsessed with it! he spends all his money on books and other d&d stuff. he spends all his free time playing or hanging out in game shops. all his friends are d&d obsessed too, so whenever I'm around his friends that's the only thing they talk about. his idea of a date is me sitting around and watching them play. on the few rare occasions I get to be alone with him, he speaks about everything in d&d terms!

i've tried talking to him about it, but he always gets mad at me and says I'm trying to change a fundamental part of him. that always leads to me snapping at him and telling him to start living in the real world with me instead of the fantasy world he created. is there any way to get him to stop playing?
How can I get my boyfriend to stop playing d&d?
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