Does she like me? if not, how can i get her to?

[Sarcasticcrook029]

Hi, i'm gonna try to make this as simple as possible. I met this girl in math class about 5 months ago, and we became friends....good friends. We like each other's facebook photos, we mention each other in tweets, we talk, and laugh, etc... But 5 weeks ago, I started having feelings for her. I started texting her and everything was normal. We send smiley faces, sometimes flirt, and talk about general things in life. But I noticed something...Since i started texting her, she kind of changed. Before, she used to give me a friendly punch to the shoulder, or say "heyyyy, sup homiee!!" but now, she never even says hi. She's just been acting like we were never good friends once I started texting her. But in one of my classes, I noticed her looking at me, then she smiled, and looked away, I did the same thing in return. That's the only time that I thought she was trying to talk or flirt with me. Do you think she likes me?
P.S. she flirts with a lot of other guys, too; not just me.
P.S.S do you think I should keep texting her? Is it even worth it anymore?