I need to know

Daisy
So today me and this guy where having sex he had always wanted to be with me but I had a bf and so we where hanging out today and well we got to the point where it was about to happen so when I got on him and he put it in not even 10 seconds later he told me to stop bcz he was about to cum ? Why was that is he just bad or what ? He told me that had never happened to him before Thoe lol