Why is she flirting with him?

I work with a really hot dude, he's really flirty with me & every other girl he meets. He is in a long term relationship and does literally no work. I can't stand him.

My friend recently started at the job. She is engaged & has a ring. She flirts back with him, and gets mad when he talks to any other female. Me included!!! I HAVE to directly deal with him because I have been promoted. The supervisors have me watching him 🤬 .

Why is she getting jelly like this, flipping her hair at me, not doing her job, wtf
Why is she flirting with him?
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