Porn?!?!?

So.. I was using my boyfriends phone the other day because mine has been glitching and being stupid. So he gave me his to let me use. And as I was using it I went to Google because I needed to look up something but I couldn't remember what it was called. I had looked it up before and I knew it was in the search history of it. As I was scrolling trying to find it I saw Pornhub stuff. And it made me feel insecure because the girls were skinny and pretty and they do stuff that I'm not comfortable with doing during sex. I would've been totally fine with him looking at porn but it made me feel insecure cause it was girls that look the opposite of me. Im on the bigger side and im wayy far from pretty. But I asked him about it and he promised he didn't do it. He looked it up during the time I was at work. But when he said he didn't do it. The only thing I could think of was his brother. We've had issues in the past because of his brother and I remembered his brother has access to his phone sometimes. And his family don't like me anyways and I don't like some of them but I dont tell or act on it because I don't want to make his life hell. And I'm trying to make sure he's happy. But it's about to come to the point where it's time I talked to his family about what's been happening. What do you guys think I should do....??