Why is he so wierd with ONLY me?

alright so theres this guy i like alot im in highschool so dont say im to young or whatever people tend to say. me and him talked so much back in 09' but now we hardly even talk. he always acts like he likes me in person(even my friends say) and he walks by my classes just to see me when his are almost 3 mins away from mines and he gets late to class. but when it comes to texting he replies max 3 texts and then he just doesnt reply ! two days ago i texted him and said "(his name) :D!" him:"heeey (:" me"what you doinn" then he didnt reply this isnt the first time hes done it and trust me he textes alot of people and i prank call him to see if he has his phone and he answers it -.- does he hate me or something help