I don't think I would have acted quite like THAT, but I definitely understand why that was frustrating.

An ex of mine was terrible at accepting "no" (especially when it came to "sex") and it was partly what drove me away from her, not before causing a bunch of issues. It was incredibly frustrating... like we're supposed to be all gentlemanly about saying "no", but women are exempt for this rule?

I get that you were "horny" as all balls, but he obviously wasn't in the mood, not to mentioned you guys not long already had sex. Some people don't work that quickly.

Anywho, to simplify:

He rejected you because you were pestering him when he already said no, and it probably irritated him. There may have been another reason, but, based on what you've told us, I see no other likely reason.