Pokemon go app

So my fiancé recently upgraded to a iPhone just so he could play Pokemon go. At first it didn't bother me much. I want him to be able to enjoy his hobbies as much as he can. But it's starting to get ridiculous. THats all he has time for these days. Whenever we go out to eat he's on his phone. At home he's on the stupid thing coming in and out of the house so he can catch them. He tells me that he doesn't want me leaving the house after midnight if he's not awake or with me which I don't have a problem with because it'd be weird. But he leaves the house after midnight to go catch Pokemon. I told him that bothers me especially when he leaves and I'm sleeping and have no idea he's gone. I'm 8 months pregnant and I guess it's selfish of me to want him near me at night. Our sex life sucks because he's too busy chasing Pokemon to ever want to do anything. I feel like I've been replaced by a stupid game.