So I think he likes me???

No, sweetie, at your age he is definitely NOT using your affection to his advantage. How would he even know you like him unless you've made it really obvious? Guys at any age are pretty slow when it comes to picking up that we like them no matter how much we flirt with them (for evidence of this just look at how many questions on 'does she like me' 'is she flirting with me' there are on this site lol)

At that age his behavior is typical of a guy with a crush. He likes you and now you have to up the flirting and see if you can get him to ask you out. If he doesn't and remains clueless but keeps up acting the way he is, then you should ask him out. Keep it light and casual though. You can say "We should hang out sometime after school" or "Want to have lunch together" or "I was thinking about grabbing some ice cream after school, wanna come with me? " and build from there. Feel free to insert whatever activity you like if ice cream isn't your thing.