Single most perplexing conversation I have had;

I was on my way to Math studies, at room B3-09 and was stopping at every few classes on the 3rd level to read the room numbers. Then this guy came by.

Guy: Hey, what class do you have now?
Me (I couldn't recognise him, except he might be the one of the many people I have failed to recognise since coming to school): Oh Math Studies.
Guy: You take math studies?
Me: Yeah
Guy: What class is it in?
Me: Somewhere around this side, B3-09
Guy: Oh

Then he turned to walk away. I stopped for a moment then called after him.

Me: Hey are you in my class?
Guy: No, I was just admiring you

Then he walked off. I turned to walk off too before what he said sank in. WHAAAAATTTT?!?