Amazing partner, bad sex

I have an absolutely wonderful boyfriend but our sex life seems to only be satisfying him lately. We used to have amazing sex, he would make sure that I was fully satisfied before he would finish himself but now he can only last long enough to get himself off and me riled up. I know he feels terrible about it and he does offer to help me finish other ways but by then I'm usually so dispointed that I've lost desire. It's beyond frustrating and we've talked about it but I don't think he takes it as seriously as I do. It seems like hes developed a sexual dysfunction but it's happened so fast that I can't help but feel bitter. A part of me just wants to stop having sex all together so I don't feel so negative afterwards but I love being intimate and I love him, so when he gets me in the mood I find it hard to say no. Which of course makes me believe that this time will be different but it's only getting worse. I don't know what I'm expecting on this site but I am hoping that someone can give me advice because I don't know what to do anymore.

Yes I agree get him to do a physical ....