Boyfriend can't cum during sex.

I'm 20 and I've been with my boyfriend for over a year and a half. We first had sex around 3 months but he has never been able to "finish" or ejaculate during sex. He revealed to my around 6 months that at a young age he had a non-cancerous tumor on his testicals and having it removed made it harder for him. We ever spoke with his doctor and he gave us some "tips" but nothing works. It makes me feel less of a woman that I can't give my boyfriend everything he gives me. The sex is amazingly for both parties involved I assure you. But but I just wonder if anyone else has had this problem. He can finish on his own but never during sex. We've also talked extensively that being French his past, all rich princess types, found cum quite gross and he "discovered how to really make love with me." So mentally he has a hard time with it to.