I (23M) had sex recently with (23F). The buildup was intense. 

I was so god damn horny. But after I orgasmed, I went silent. "Is this what life is about?" came to my head....I just stared off at the floor as if I was looking into the abyss. Into my own soul....I saw a reflection and I didn't like it

So she notices me staring at the floor and not saying anything and asks me "Is everything ok?? Why aren't you saying anything???". 

I just stared at the floor and then got up and got changed. She said "Um where arw you going?" and I didn't answer. I just left.

It was like I was in a trance of some sort....an existentialism of sorts. Her friends have now called me out as being an asshole AITA?