Alexander volunteered to help the royal family to kill you, he did everything to protect you and for you to put your trust on him purposely. And when it was finally time for him to kill you he believed you deserved this. Despite knowing you weren't involved in the rivalry of the royal family and your family he was too loyal to the royal family to care. Alexander never once cared about you and simply saw you as an object to finish as it was necessary for his work.