Can't reach orgasm

Idk wtf is wrong with me. I can orgasm by myself using fingers or a vibrator on my clitoris, and I used to be able to orgasm with my man using the vibrator while we had sex. But its been over month and we keep trying, even trying different positions and I just cannot get there. Its not him either, he really does try. He's so patient and listens when I tell him what feels good and what could be better, and he even keeps going when he's ready to be done. And I'm definitely aroused, I get very close but then I can't make it over the mountain. I'm so frustrated that it makes me cry every time we finish because I'm so mad at my body for not working right.

Any ideas how I can fix this issue?