A good form of revenge is living life well.
That prince is doomed anyway with the lack of brains he seems to have. Based on the story, our protagonist studied extremely hard since childhood to fit into the role of queen, which that idiot definitely didn't take seriously to become king.
That healer girl also was chosen by that prince because she could smile and laugh of all things. That country is doomed fr.
I bet that after we marinate the story for a while we will get a prince interlude where that idiot is scolded by his family for breaking his engagement.
It's likely that the prince would have a sibling or something that will take over as crown prince, since that's a trope that happens often in these type of stories. (Younger sibling of the idiot first prince strives to be a better person than them and ends up taking the crown after the first prince loses his capable fiancée.)
Can't wait for that idiot to get a reality check! ✧ ♪ ⋆

I love a good revenge story, and i swear im a step closer to getting an aneurysm when the abuser gives a few crocodile tears and is quickly forgiven.
But, so far, it's not that. I really love that our MC just moved on and made decisions for herself. For her happiness. I still want to see consequences for the prince, but im happy seeing Charlotte explore the world and having fun being free of her position as fiance.