@Lvm try reading a little bit more. It's clear that the woman has violated something but we don't know what is the severity of breaking that promise. Base on what the MC told us it is something serious and needs to he address for his family and kingdom. Try to comprehend a little bit more about their dialogues.
I SQUEELED SO LOUD, I ROLLED AROUND LIKE A LUNATIC OUT OF HAPPINESS (●♡∀♡)