My crush is acting like a total bitch towards me now?

Anonymous
So I go to hang out with her and her group of friends at lunch. At first she is acting really cold towards me. Then she is asking everybody but me about the electives they've chosen for next year. I ask her a question and she's being so quick about it like she doesn't even care.

Then I talk to her friend who is female, and then all of a sudden she wants to talk to me. While I'm talking to her friend, she interrupts me to ask if I've watched a certain tv show. She pisses me off so much. So I gave a kind of cold response because I don't want to talk to her if she's gonna be a bitch.

Then later that day when she walks by me she waves hi to me and I sort of wave coldly back because I was too pissed off at her.

Before, she was always so flirty with me.

I don't know. Why is she being so cold to me now? Did I do something wrong?
My crush is acting like a total bitch towards me now?
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