I want your opinion ..

My husband (age 23) constantly looking up porn and he just started looking on tiktok for “thiccgirls” hashtag for him to master bait.. is this normal ?? It makes me really insecure and I have ask him over and over to stop. He cheated on me once with my ex bff . They didn’t have sex but she was asleep on the left side of me and he was on the right. They played with each other and touched all everywhere. (This has been a year and a half ago and nothing has happened since then or prior to that. My head is everywhere typing this post ... I don’t know what to do... if he isn’t ready to be in a committed relationship we should have never gotten married! 😭😭😭😭😭😭😭😭 my head and heart hurts😩😩😩😩😩