My boyfriend has done this throughout our entire relationship...
I tried to talk to him about it numerous times but he still didn't care... He really was addicted... He's made an effort to not play as much and ignore me... as much... but it still does happen... I don't even think he realizes how much he plays. He loses track of time is what happens. It's pretty frustrating... I realize after almost 6 years that it isn't going to change.. so I just found my own hobbies so he does his thing and I do mine. I've just accepted it now.