Why is my married coworker jealous when I talk to other women?

Why is my married coworker jealous when I talk to other women? I’ve noticed this for a while now but recently it’s got worse. When I talk to other women she always staring from afar but if she’s close she always intervenes.

I was sitting with her during lunch and as soon another co worker came along and started speaking to me, her face just dropped as if she was angry and annoyed.

Why is she doing this to me?
Why is my married coworker jealous when I talk to other women?
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