Eyesights Love since 4 years .

I am in love with a guy in my school since four years . We used to see eachother every week in the mall with his family and mine by coincednce . He made me notice him by being confused and sometime s run everytime he sees me :S . He denied everything and he said i don't love her and never will i . I caught him looking and seacrching for me couple of times . He can't talk with girls propably when i am infront of him . Everytime as a friend when i ask about him and sends a msg for him he doesnt reply and never will ask or enter to start a conversation . Why is he doing that ? what does that mean ? :(