Do u think hes so not interested?

Ive just started a new school a couple of months ago, i'm in my final year and theres this guy in my cl whos realy cute and seems nice but he dosn't seem to notice me, the most i think hes ever acknowledged me was when i gave eveyone in my year a christmas card and he gave me 1 back but like yesterday it was non uniform and i was wearin skinny jeans, high heel boots and a grey v neck top and i was chattin to my m8s on the stairs, he walked past and didn't realy look at me at all, then he startd talking to my male mate and walked past agin, another guy i know at school told me he saw him looking at me in science like he likes me so he thinks he does, do u think hes realy not interested? x