Should I Tell him that I can't orgasm?

[hilululu]

I always orgasm, really strongly too, when I masturbate. But I have never orgasmed with a partner before. I'm not sure why either because it feels really good during sex, I just can't ever finish. And it doesn't bother me that I can't finish, I still love spending close time with him. But it bothers and stresses me out that he always asks if I finished, and I am bad at faking; part of me wonders if he knows I'm not finishing. He always asks me if I finished, and says that he doesn't mind to keep going or do what it takes to make me finish- but usually by the time he is finished, I am sore and not near orgasm.

Should I tell him that I can't orgasm? Or should I not bother, since I really don't think there is any way to fix it? I don't want him to feel like he is doing something wrong.

And if you were a guy in his position, would you want to know or not?