Hi! Its been quite some time since I posted but I need some help

My boyfriend and I have an AMAZING sex life...we're as compatible as can be and its great. I love him and I have no doubt he loves me. BUT....he can't reach orgasm with me. He has no trouble doing it alone, but during sex, fellatio, handjobs, or even if he masturbates in front of me, it just doesn't work. He gets EXTREMEMLY close...but never orgasms. He is 23 and has yet to even orgasm with another person (I was his first girlfriend...he had a one night stand once that is the EXTENT of his sexual experience.)

He says he's fine with this-that pleasing me makes him happy and that he likes the way it feels and orgasm isn't necessary. And I try and think that "Its ok...as long as I'm pleasing him its fine" but it really does hurt me that I can't make it happen OR that he has some sort of mental issue scaring him. Anyone have this problem or any suggestions, mostly just to keep my hope up?