NGL this entire series (and "villainess has her engagement broken" stories in general) has become infinitely funnier to me now that I've learned about "Breach of Promise", which was basically a law that forbade men from breaking engagements.
(Since in real life during the time this law would've actually been enforced, men were the only ones who could propose, women were conversely the ones who had the power to break it off should the man prove undesirable- "it's a woman's pejorative to change her mind", after all. Although given the familial politicking involved in noble engagements, whether a woman actually could invoke this right is another story...)
In other words, every time a man breaks his engagement in these stories, he's doing something illegal.
... Actually, I wonder if that's where the condemnation thing came from? Since the original idea is "a man is trapped by his engagement to a vile woman who refuses to break it off," proving she's some sort of criminal would provide a defense against a breach of contract suit (there is a precedent in real life that a man could file a countersuit if he could prove the woman only got engaged to him for his money) but over time the game of trope telephone led to the current story format.
Anyways, I'm adding "Breach of Promise" to terminology I wish villainess writers knew about, alongside "morganatic marriage"