Who knows? It was a one night stand maybe he did not orgasm, maybe he did it to turn you on, maybe he had blue balls.

Maybe he didn't want to cum in you?
Who knows.. Could be a fetish for him?

I know for myself, i have absolutly no energy afterwards to do that lol

wow

Guys have ejaculation for three reasons:
R#1. As a physical demonstration of the love a couple share
R#2. In order to relieve and eliminate stress
R#3. For the pure enjoyment of it all

Could be that after #1 was satisfied, he went on to #2 and/or #3 after the fact.

The male of the species can make love and also have sex with self or not independent of one another.