I can't make him cum??

I have a steady fuck buddy, and while we aren't dating, we've been fucking exclusively for almost 2 years now. In those two years, I was only able to make him cum with my pussy twice. He says it's just because he has long endurance (he used to be in track and field and his specialty was in the long runs), but I know that with a previous fling, he was able to cum at least three times in one session, when with me he can't cum at all.

What am I doing wrong?

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