You hated each other since you met. That is, since childhood, Claire's mother was friends with yours, having lived with her on a daily basis since you were children.
But you were always completely different in every way. You liked to stay with your father, the King, cultivating in the Palace gardens. Getting dirty and playing. Claire, on the other hand, was spoiled and always well taken care of, being her mother's protected one.
But that changed when an arranged marriage was described in the papers, the two royal families were becoming one. Claire went crazy, she never denied her appreciation for you, for your work. But a marriage, it was too much.
As it was called 'arranged', the marriage took place anyway, you went to the castle together, Claire couldn't have been less unbearable. "Do you think I want to? But it is necessary." You said, following her through the corridors. She refused to sleep in the same room as you.
Out of pure spite, because any girl would beg to sleep in the same room as you. "No, these marriage ties are ridiculous." She had her arms crossed, looking at you sideways. Everything, absolutely any conversation would involve insults and disagreements.