Like or Love or wants to get my attention

Hey there is this one girl in my school I use to be friends with but now were not friends anymore due to argument. First of all to start from the beginning I well tell you how we met. It was the re-open day of high school I met her brother and he introduced me to her sister and we got to say hi to each other and the next day when I was at the library reading she came there to and met me and she was looking for a empty table but there was so many empty tables but instead she came to my table and she said hi. Things were going well for us because we always say hi to each other anytime when we see each other and and play with each other like teasing each other.When me and the girl had our arguments with each other we stopped talking and we still have not talk to each other for like 2months and anytime when we pass by each other she gives some strange look that I can't describe and if she's with her friends all of them well look at me as if I have done something wrong. Please I wanna know why she gives me those strange looks and I can't get her of my head because it seems i'm starting fall for her.

What was the argument about? If you said something you feel guilty about, catch her alone and apologize. If not, just ask her in a calm, respectful way what it's about. If you don't get a calm respectful answer, that might be your cue to look for someone else to "fall for."