A fanale coworker dates in secret another coworker, but she sends signals to me? Why?

Anonymous
She is dating your coworker from about 5 months, but she is acting strangely to me.
There are days when she strokes my shoulder, winks at me, smiles at me, asks me personal questions, compliments me, turns to me as she talks to me and looks me straight in the eye (all that if he's not nearby).
Other days she pays absolutely no attention to me and she treats me with coldness and detachment. Sometimes she asks me what I did over the weekend, and when I ask her the same question, she tells me she went out with some female friends or didn't do anything.
I tried to ask her to go out with me on a Saturday if she doesn't have anything to do, but she never came (but she inquired about where I would go specifically and with whom).
Why is she acting like this?
A fanale coworker dates in secret another coworker, but she sends signals to me? Why?
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