What was her behavior all about?

Girl at work is in a serious relationship, but her and I went back and forth for a long time. She acted like she had a huge crush on me forever. I also noticed she would occasionally flirt with my buddy too, but never saw them talking like we did. I backed off and ignored her, now my buddy is telling me that she is walking and talking with him like her and I used to? They park in a different lot than I do so I didn't know until he told me? What's this?
What was her behavior all about?
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