Why is she avoiding me?

We used to be friends and talk and flirt all the time. She would text me first, not the other way around, and we would have long conversations. At one point she probably liked me. Lately though, she's been cutting conversations short and the like. No flirting, and today when I went over to talk to my best friend, who she was talking to, she turned and left. Why is she avoiding me? I really like her. WTF did I do?
Why is she avoiding me?
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