Thanks for the input, from the responses so far it sounds like most guys do like to be stroked while they're ejaculating. I never did really understand why my ex made me stop when he came, but regardless he still seemed to have really strong orgasms that way. It was like he was stopping right at what's supposed to be the best part!
He wanted you to stop. It felt good enough he came. Stop over analyzing things. I know if someone keeps going on me it hurts.
Don't think porn is real. Pay attention to what your partner likes. Not what you think he should like.