How to prevent a quick orgasm from maintaining a healthy sexual relationship?

Hello doctor,

To keep him and my relationship with my fiance intact, I need help. Before our in-person meeting, we had been in a long-distance relationship for two years. We were toxic and experienced ups and downs. We met when I was taking medicines for my polyps as well. Because I could not care for him while he was engaging in oral sex, my fiancé was broken. Either I was unable to, or it had not concluded quickly. He believes he is not the best because I arrived earlier with my prior partners. My hymen was broken, and I struggled. This is the best for me because I never had that experience with anyone, but he views it differently. And as a result, our partnership is coming to an end. And I am frustrated, too, since I have no idea why it did not. And I have warned him that I will have a rapid orgasm. Before the meeting, we fought about that as well. I am, therefore, not sure why. And I truly need your assistance, even if it is just suggestions on how to make this work or to aid me in determining why or what the possibilities were for why it failed. Kindly help.