This case is based on the events described in "The Princess and the Pea" in which a Prince finds a real princess because she had felt a pea right through twenty mattresses and twenty eider-down beds (and) Nobody but a real princess could be as sensitive as that.
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The Princess and The Pea - By Hans Christian Andersen (1835) - from Geocities.com
While they waited for their upcoming weeding they saw a lot of each other.The Princess said it wasn't fair to cancel the wedding since she was a real princess which was what the Prince had wanted.
The Prince, who had first thought all of his dreams would be met by finding a real princess, discovered that nothing he nor anyone else did for the Princess was enough for her.
She blamed and complained to everyone that she was not being treated like a real princess, and this tortured her in mind and body.
The Prince having seen what life would be like with the Princess called off the wedding.