This boy I like..puts his number in my phone?

Okay so i have biology class with this boy..who puts his number in my phone. He asked for my phone twice just to put his number..its been a day. Since he put his number and i havent texted him. I dont know what he tried saying by that? But yeah he is sorta a flirt..most girls thinks hes cute. In class he always tries getting my attention..he squished me until theres no room for me to scoot on down..I dont want to be all happy about that because what if its not like that? what if he wants to be my friend? i'm not sure what to do or think with this situation. Thanks(: