I told my boyfriend he can't hang out with a friend, am I the one in the wrong? [F19] [M21]

Hello! For some background, I’m a 19-year-old female, and I met my boyfriend, who is 21, two years ago. We started dating quite quickly. He’s Japanese, which has introduced a few cultural differences, but overall, it’s the most loving relationship I’ve ever had. He takes me on dates, calls me every day, helps carry my bags, and does many thoughtful things that show he’s genuinely sweet. He often talks about marriage and tells me I’m his dream girl. However, we’re facing a significant cultural challenge. He expresses interest in subscribing to OnlyFans and visiting brothels, viewing both as services rather than acts of betrayal. After much conflict, he eventually agreed not to go to brothels. He insists that brothels are simply a service, but when I expressed my discomfort with him subscribing to OnlyFans, he said he resented feeling restricted. We’ve had several arguments about it, and he argued that if he can’t follow OnlyFans accounts, there’s no distinction between that and being a fan of an online idol, especially if meeting them in person feels similar to a relationship. I feel really hurt. I know this shouldn’t be a contentious issue, but losing my virginity to him was a deeply vulnerable step for me. I’m not interested in other men, and I don’t watch porn at all. Because of this, I find it hard to understand why I don’t feel sufficient for him. I’m torn about whether I’m being overly jealous or if this stems from our cultural differences. Edit: I should also mention that my boyfriend cheated on his last girlfriend, which is probably contributing to my feelings of insecurity.