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Spoiler
So it shows in her first life the prince and her loved each other but then her memory of that was covered up by the first prince casting an amnesia spell. She eventually became the prince's fiance and suffered as a prisoner with no visitors and her letters stopped until the maid poisoned her on the first prince's orders. Then in the second life the first prince is torturing her again and the fiance dragon is "trying to get close to her" but he's just causing her suffering too.