Questions: Flirting

So I recently became friends with this guy, and I've grown to like him. He's in my computer lab class with my other guy friend. They sit behind me and we talk and joke around the whole class.

I got my braces off like a month ago, and I didn't talk to him that much then. But when I got them off he told me that my teeth looked really good. He also smiles at me every time I talk to him. Twice in class he's thrown little things at the back of my head teasingly, and then I laugh and throw them back. Then yesterday at lunch, I got up with my friend to get something and when we walked by his table I happened to glance at him and he was already staring at me. Then 5 minutes later when I sat back down at my lunch table, a wad of paper was thrown at my back from behind me (he sits behind me). My friends and I looked around to see if anyone looked suspicious but we didn't see anything. I thought it might've been him since he always throws little things at me.

Ow, my fingers are tired from typing. But vote down below what you guys think he thinks of me based on all this information. Thanks so much!!