What is the Shar'i ruling regarding a husband who prefers another woman over his wife during disputes, causing psychological harm to his wife?

Allah has obligated the husband to treat his wife with kindness, and this includes being gentle, speaking kindly, and avoiding harming her. Comparing one's wife to others for the purpose of favoritism is impermissible and contrary to treating her with kindness. In return, the wife should avoid anything that angers her husband, close the doors to disagreement, and earn his satisfaction through her submission to him and her obedience to his command, while bearing in mind the mother's advice to her daughter regarding safeguarding the husband's rights.