Boyfriend is obsessed with this game

My boyfriend is obsessed with Rust. I don’t even play the game, I played it once because he wanted me to. Other than that I know almost everything about it at this point because of him. All he does is play this game 24/7 other than work and he even falls asleep watching videos about it on youtube. He’s on it right now upstairs and I can hear him talking to his friends online talking about raiding and something about sulfur. But yeah we sleep in the same room obviously and while we’re going to sleep there’s rust videos playing on youtube on the tv lol. I don’t know how he hasn’t been tired of it because he’s played it for years nonstop pretty much. Obviously he does other things but when he’s not busy or doesn’t have anything to do he’s on rust. He’s so into this game rhat I’ve walked into the room and said something to him multiple times and he didn’t even know I was there. Like I said before I played it before because he wanted me to and all I did was hit a tree with a rock and then someone came up behind me and killed me lol I don’t see what’s so addicting about it but there’s something obviously. I found this group searching rust on reddit but can someone explain this shit?? It’s not like relationship ending bad but he drives me up the wall sometimes