Boyfriend & porn??

NO HATE. I WILL NOT ACKNOWLEDGE YOUR COMMENT.

My SO and I have been together for 3 years. He's always watched porn, just like any other guy would. Except, now it's getting weird.

He keeps downloading this porn app with TONS of pictures of other girls on it. I find it and delete it, (you would too if you saw some of the stuff he wrote on there and the pictures that he saved from it)

But he just keeps reinstalling it. He hides the app on his screen, to where you need to do something special to access it. Hard to explain.

But what should I do? I'm very uncomfortable with it. He's known this but still continues to do it.

One of the things he posted on there that really creeps me out it "Show me what gets you rock hard ;) " like wtf? Someone please give me some type of advice.