Have you ever flirted with a taken guy?

Just was curious if this is common and if you said yes I’d like to know the reasoning behind it.

My boyfriend has coworkers who are aware he is taken yet persistently try to cross boundaries (trying to go with him to his car during breaks, hugs, flirting, trying to hang around him/talk daily). Today one tried to go with him out to his car, he told her he was on the phone with me and she said “oh would she get mad?” 🙄 Yes bitch priorities and you aren’t one of them.

I’ve never acted so entitled to a man who is taken, like the girlfriend is the inconvenience to me.