What do these girls think?

What do these 2 girls think. There is one girl named Jennifer who has two friends named Christy and Sally. I am a freshmen by the way. I asked Sally if she knew anyone who wanted to go to homecoming. One day Sally introduced me to Jennifer, I chit chatted and that was it. She told Sally to tell me to add her on myspace. I did but nothing happened. This is the weird part, about 3 months later, everytime I would walk by Christy and Jennifer, Christy would say, "oh look it's sally's best friend Devon." She would look at me quickly then turn away. This happened twice. Just recently my friend and i were walking about 12 feet behind them and they whispered in each others ears and Jennifer turned around smiling.(attempting to do this casually.) Next girl, I may be overt thinking this but what ever. I have NEVER talked to this girl name Candra. I would always see her around school and what time when i walked past her and turned around and she was looking right back at me. I will sit with my friends and she walks by, looks at me smiles, i return i contact and she quickly looks away. Just today I was hanging out in front of school with a couple of guys and one of my friends walks by with her and I ask him if he has change. He says no and she says no. She walks by and then realizes I was the one who asked for change, not this other guy. She comes back and asks how much do you need. I said 50 cents and she said I only have a penny and said sorry. I said Oh well and she walked away.