Why does this concern me?

Cecilia Ashford, the eldest daughter of a Duke, recently suffered a public downfall at her noble academy’s graduation ceremony. Accused of cruelly mistreating her sister and engaging in an illicit affair, she was stripped of her title as the future Crown Princess, and the Crown Prince chose her sister as his new fiancée instead. Following this disgrace, Cecilia is quickly married off to Margrave Leonhardt Trevant. However, their new life together begins with a harsh rejection: Leonhardt coldly declares that he has absolutely no intention of accepting her as his wife or treating her with the respect due to a Margrave’s spouse, completely oblivious to the consequences this decision will bring.