Well, it certainly isn't Snow White and Prince Charming but Charles and Diana are far from being the first couple whose lives were ruined by arranged or manipulated marriages for the sake of the Monarchy.
I honestly don't think you can lay blame on either of them. They were both victims of an antiquated idea of royal decorum. Charles remained single for so many years presumably because, as heir to the throne, he could not marry the woman he wanted. Finally, under great pressure to marry and prtoduce an heir he marries a woman who is from teh right bloodline and has teh right breeding but, whom he doesn't love. She being young and naive didn't realize ahe was to be like every other Princess in history and just be happy to be Princess, act as the perfect symbol for her country and allow her husband to be with his true love.
If things were updated and the monarchy stopped worrying about bloodlines, Charles probably would have married Camilla many years ago and history would be different.
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