Why is my Boyfriend so Weirded out by this?

One night, we were drinking vodka in a hotel-room and then all of a sudden he and I were like wrestling. And at one point, I was balancing on my hands and knees on his chest and he pushed me to the floor. No one was even close to being hurt, don't worry. But, he had this expression on his face of amused/pleased/turned on, with a smile. And as I ask him who started the wrestling match, he tells me that I'm scaring him away and that it's not true. And that I'm making stuff up. Why is he doing that??? What is so wrong about that scenario? Or is it some sort of secret special thing? PLEASE TELL ME!! Thanks, Emma.