Description: "As they depart she vows to make him regret not choosing her"
This ex-boss sounds like a black-company-like evil manager who'll hold a grudge against the MC
Reality: "Too bad. I hope you'll change your mind next time we meet"
Turns out she's just more dynamic (because younger and not yet burned out) than the MC, and doesn't ressent him for not partying with her, and instead hides her sadness.
What a misleading description.