Can’t make him cum

Ive been w/ my bf for 3 months we haven’t had penetrative vaginal sex, but i have done oral sex on him, its been 3 times and i have not been able to make him cum. He is hard and gets wet but it just doesn’t happen, im not too experienced w oral (only a few times with my ex and he was able to cum every time) so this makes me feel im not hot or desirable enough, its really worrying me. He tell me it has nothing to do with me, that he just takes a while, while at the same time saying that it will happen its just a matter of me finding his spot..

😩 the mor the think about it, the worst i feel about it, I cannot help but think on how his ex possibly was able to and now im here not being able to ☹️☹️

Update: we had sex it was AMAZING and he did come. Then the next day i gave him oral and he also did!! 🙌🏼