Ignoring and being ignored by a person is having an effect on my mental health. How to deal with it?

I was interested in a co-worker, but came to realize that she was only seeking attention. She would act desinterested when we were alone, but would try very hard to get my attention if was talking with other girls, to the point of invading the conversation. I found out that she was seeing/dating someone else and decided to move on.

To make the process faster, I decided to cut communication completely (except work-related) and to avoid her as much as possible. Once I started, she made a few shy attempts to make me talk with her again and, when they failed, she went full silent treatment, to the point of not saying hi, and she also gives me very angry stares from time to time.

I never had to ignore a person before (I was lucky to never had daily contact with any ex-grirfriends/ex-crushes/enemies), so I feel deeply frustrated and hurt about both ignoring her and being ignored.

Ignoring and being ignored by a person is having an effect on my mental health. How to deal with it?
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