Well if a boy (shy around girls) do these things to one certain girl... can it mean that he likes her? Or is it only just friendship?

* he looks at her and wait for her to look, then he smiles
* he has known her for 6 yrs but never ever talks to her
* he doesn't look at her when they are walking close by coincidence
* he always sits behind her at class
* HE ALWAYS SMILES AT HER no matter where they are.. even with friends.. out of school etc..
* he's shy around girls but he likes to talk to girls who are friends with his friends

So can this mean that he likes her? Or not?