I'm going to tell my boyfriend if he doesn't stop playing video games then I'm leaving him
Why would you leave him just because he plays video games?
I want him to spend more time with me, not a TV or computer screen.
I don't see why you should do this. Playing video games isn't hurting anybody. If you want more of his attention, tell him.
I will tell him because I think he will listen.
That's good. Hopefully you both can come up with a compromise that suits you both.