does this girl like me and i add her on facebook!?

[Peter]

I add this girl on facebook and im afraid if she wont accept my friend request . So .
ok I had a class with this girl last year and we caught each others eyes all the time , when I caught her looking at me she smiles a little then look away . and during break time I caught her more than 3x looking at me and then she looks away .I never talked to her because im scared to get reject and shy
and one time we passed each other in the hallway shes with her friend we looked on eachothers eyes for 2 seconds then she looks away , And I notice sometimes when shes with her friends theyre talking but theyre looking where im standing with my friends .