Boyfriend, video games, lack of sex

So much anymore, I don't feel attractive or appreciated by my boyfriend. We've been together over 1.5 years. We have mind blowing sex, and it used to be all the time. I know, the honeymoon phase. But here in the last couple weeks since he's started gaming again, it's a struggle to even get a hug and kiss. We fight all the time about the game, which he turns it to my fault. He doesn't want to hear what I have to say bc "he's a gamer". But he plays the game daily for 6-8 hrs. And the days he's off work, he plays for 12-18 hrs. I ask for sex. I beg for sex. But he's "not in the mood". But it hurts bc I literally don't feel pretty anymore. And the more I try to talk about it, the more it causes a fight. I don't know what to do