Why does he always get happy and smile whenever he sees me?

He knows I like him and I only spoken to him 3 times. Anyways he has a habit that whenever he sees me from a distance while heading towards each other direction, he gets super happy and can't stop smiling. This is each time he catches me from a distance while walking while we lay eyes on each other. I've caught him checking me out before and smirking. Could these be sign he's feeling me?
Updates
+1 y
Also, I'm always alone in the hallways of my uni when he smile cheesy
Why does he always get happy and smile whenever he sees me?
Post Opinion