Firstly, the lady whom the King has chosen was the most hated lady for his daughter. "The girl was lovely, but she had dared to raise her eyes to the loved one of the princess; and, with all the intensity of the savage blood transmitted to her through long lines of wholly barbaric ancestors, she hated the woman who blushed and trembled behind that silent door" (Stockton, 1882). The second thing is that the King was semi-barbaric, so if he wanted, nobody would know what was behind that doors. In case that the King let his daughter know the secret, she could decide her lover fate by her own.
Although, there is another evidence proving that the princes' love was true. "How often, in her waking hours and in her dreams, had she started in wild horror, and covered her face with her hands as she thought of her lover opening the door on the other side of which waited the cruel fangs of the tiger" (Stockton, 1882). From this context it is seen that the princess insanely loved the man and she would better prefer to suffer, than her lovely would torn to pieces by the