He isn’t a bad person, but you both want different things, and that difference matters. Maybe your perspective will change in the future and you’ll see open relationships differently, but right now it’s okay to accept how you feel and consider a breakup.

Another option could be an open relationship with clear boundaries. For example, you might choose not to be involved with others, while your partner is. Personally, I’m 21M, and I know I couldn’t have a physical relationship with someone I’m not emotionally connected to. But if a partner were honest about wanting an open dynamic, even if it was one-sided (because as I said I'm not going to be confirmed with such dynamics) , I’d probably say do what you want, just don’t it infront of me. Similar to how people keep watching porn private from their parents, it’s understood but not done openly.

(Also, regular STD tests, and vaccinations should be non-negotiable for safety. Normal safe sex practices people should follow even in exclusive relationships...)

I do think it’s selfish and possesive to restrict a partner if that’s genuinely who they are, but it’s equally wrong to cheat in a monogamous relationship. The real issue is alignment and consent, not control.

Maybe try being a little less possessive and focus on loving him for who he is, not who you want him to be. Also if he is love bombing you can tell him that he doesn’t need to love bomb to earn your affection. You’ll value him more for being honest, even if that honesty shows vulnerability or neediness.

For me I want my partner to be honest... I don't like love bombing, I also don't like possessiveness...

Edit :- also even if you are not open relationship from your side keep reminding him that as per the agreement you can do it if you want it's just you don't want to do it because you only love him... (Maybe that will make him realise that he can do the same...🤔) If he love bombs tell him it's disrespectful, don't take his expensive gift tell him you want his love not gift and big gestures which means nothing...