This lady flirted with me when she already has a boyfriend at my work, is that normal?

I work at a restaurant and we were slam busy, so this lady tried to flirt with me so her and her boyfriend could get a table, she was like 10 years older than me I think. She called me handsome and said a capable guy like me could certainly get them a table, which caused me to stutter and blush.

This lady flirted with me when she already has a boyfriend at my work, is that normal?
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