Why would he block me after admitting that he has low stamina and cums fast?

I was talking to this guy and we finally hooked up. We had sex and it lasted around 2 minutes. I didn’t say anything to hurt him, hell I barely knew what to say. He didn’t contact me for 10 days. And then we began chatting again and hooked up for a second time. This time he told me he had low stamina and doesn’t last long in the bed. He told me it would always be a few minutes etc. We had sex and he came very quickly again. I didn’t say anything to hurt him again. I later found I was blocked on phone calls and text messages. Not social media pages for some reason. I don't know what to make of this. Any ideas?
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So since that time he has unblocked me, and then blocked me back again. I am not going to dwell on his actions. His behavior seems strange. Maybe one day he will talk like an adult and we can carry a conversation.
Why would he block me after admitting that he has low stamina and cums fast?
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