just my opinion.. but, this "game" he's playing--teasing you and such.. it only makes you like him more. and if he's as smart as i think he is then he's trying to get you to make the first move.

now, what you should do:
tease that ****er right back. take the games to a whole new level, because you are female and I think girls kick ass when it comes to teasing. mmmm i'm gonna leave you to figure out how to do that.

* - O R - *

the easy way is just tell him how you feel, and don't worry about the friendship! it'll be just fine, i promise.