Okay, there is this boy.?

his name is Robert but i call him "bob" (the only one in the school that is allowed too) i met him this year and we are pretty good friends. We walk to 5th period together and to 6th. I hang out with him at lunch or "the group". w/e. anyways...i started calling him and we'd talk till like 1 in the morning bout random stuff...he sang, to me im guessing, cuz it was this great country "love" song or w/e. i loved it. so we would call each other like every other day or something, a lot of our friends will see us together or we'd be talking about um a physics test and theyll be like "awww krystal, u talking to your boy or what?" or bring me and him together as a couple. He smiles...i blush and turn away. it may seem obvious that he likes me but how do i know for sure? idk then his ex or w/e wrote "kisses" "i love you" "babe...." in his yearbook. idk what to think. help! any help....