Adviceeee?

Hey so my boyfriend and I have been together for 2 years. We live about 2 hours from each other. He used to watch porn and it really used to upset me the idea that he was pretty much getting off over other girls. I told him and he told me he’d stop and I then found it on his search history. This happened so many times I lost count. He is so persistent in telling me that he doesn’t do it but I just know for a fact that he does. I also understand that “all boys watch porn” and all those other stereotypes but it really upsets me. Does anyone have any advice please