A girl with a boyfriend wants my attention. What should I do?

There is this girl who I had a crush on and she got a boyfriend about a year ago. I moved on.

Since then, she has shown signs of interest and when I talk to other girls, she gives me dirty looks.
She ignores me the other 90% of the time, just when I start showing interest again.

What should I do?
A girl with a boyfriend wants my attention. What should I do?
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