Help!? is he flirting..Lost girl!?

Okay so im a sopomore in hs and ive never had a boyfriend. Since the begining of freshman yeah ive liked this boy who hasnt really had a relationship either. He Is very handsome, so he could easily have a girl friends but he seems more interested in guy stuff with his friends. Recently ive started talking to him more I even sneakily found a way to give him my number and we started texting. He smiles at me and makes funny faces sometimes How do i know if this is flirtation Or him being friendly? And if it is flirtation how do i get it to escalate to the next level?