High school crush question?

[Jay]

So, there's this girl at school to who I've had a crush on for a long time now. I still can't decide whether it would be appropriate to go and tel lher about my feelings. I'm trying to see if she seems even just a little bit interested in me. Throughout all these time we've been seeing each other at school and I pass her by, she stares at me. Sometimes she smiles but mostly she gives me a blank stare. This has been happening frequently. Also, recently I accidentally sent her a facebook friend request and cancelled it quickly but I realised she was online at that point and so she saw it. The next day at school when I was passing by her, she was with her friends and all of them (including her) looked at me for some seconds and smiled. To be honest, I'm still undetermined about the situation cause my best friend actually befriended her (on facebook) a while ago out of jealousy and we had an argument (me and my best friend). After that, she stared at my friend, too. It mostly seems as she gives me blank stares or she behaves kinda shy when I pass by her (even if I am with my best friend). My pal also tells me various times that when I'm not around and he sees her, she always looks at him and giggles. I don't consider this true in any way cause my pal lied to me before about the situation, out of jealousy, so I can't believe him. I know this story seems so odd and maybe even rather stupid. Tell me, though. What's your concern? Does she seem to like me or not? Maybe she likes my friend?

Sorry for long post/wrong category.

Thanks in advance )