She rejected me because she has a boyfriend? now she's mad because I'm ignoring her?

What's going on here?

After the first time I ignored her, she ignored me back. Then when we saw each other, she wouldn't sy anything, just looked at me like she was p**sed off.

Then the last time we saw each other, it looked like she'd got over it and was jumping about, as if she was going to come talk to me, but didn't so I just walked off.

What's going on?

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Although we don't work together, she talks a lot to the people she works with about me - I know this for a fact. So, I don't know...
She rejected me because she has a boyfriend? now she's mad because I'm ignoring her?
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