I think some people have been a really harsh to the op who is clearly feeling a bit sensitive.
Op I think that you may have been better posting in relationships.
There coulod be any number of reasons why this guy doesn't want to meet up again, but none of which are likely to be any reflection on you, he doesn't even know you. He might already have a girlfriend/have got back with an ex. He might just prefer one night stands or various other reasons.
I think if someone genuinely wants to engage in nsa sex you've got to be a really self assured tough cookie, otherwise you're in danger of getting hurt or at least feeling rejected. Some people are able to remain completely detached even if the other person doesn't want to see them again, whereas others aren't.
We've all been there, in my early 20's I had sex with a guy who didn't want to see me again, I gave him my number and he never called, then he blanked me in a pub a few weeks later, I didn't even like him, but it wasn't very nice to think that perhaps he didn't like me either, even just for sex. And I had sex with a guy once and didn't want to see him again, I think that he was a bit hurt at the time.
It's taken me quite a few years and getting to know myself better to realise that casual sex isn't for me and that men and women are complicated beings so there's no such thing as 'most men' or 'most women'.
I think you've just got to put it down to experience, I'm positive that you're not deperate, ugly or crap in bed, and even if he thinks you were, there'll be plenty of other men out there who will think the exact opposite.
Just have a think, if you've recently come out of a relationship, and if a one night stand has dented your confidence and left you doubting yourself, maybe nsa sex isn't for you after all at this time?