Help don't know what to do!

My boyfriend and I have been together for six months. He's amazing probably the best boyfriend I ever had. He treats me well and is ultimately my best friend. However, tonight I encountered something I really didn't like. I went to do homework on his computer and he let me use his laptop on guest settings -- wouldn't let me use his screen. I thought this was strange and ultimately asked him jokingly like why couldn't I be on his screen did he have something to hide, no response from him to that just a laugh so I brushed it off. Then eventually he had to let me on his screen because the school thing I needed required a password which meant I had to be on his screen. There I saw it tons of porn apps and in the browsing history. I confronted him about it because I was upset and he told me it's not a big deal everyone does it. This broke my heart into two because I find porn to be absolutely disgusting and it's something I don't want to tolerate in a relationship. I have my own insecurities with it as well from a previous relationship with an ex. But overall I'm against the idea and won't put up with it. I feel as though if you're in a loving relationship where you get sex you don't need to browse the internet and get off on other naked women having sex. Thts completely wrong and since he views it differently than me I'm not sure he's going to stop! He was very adamant on the fact he thought it was no big deal and should be allowed because "all men do it" "all my friends do it and there girlfriends are okay with it" "men need it more often than woman" etc. so what do I do? I'm truly very upset over this. We couldn't communicate about it becsuse he felt he was right. So.. Will he truly stop? Am I wrong for feeling the way I do? I need advice. Thanks in advance.