Devaluation is a key tactic used by narcissists to maintain power and control in relationships. It involves them treating you as though you are worthless, unimportant, or inadequate, leading to feelings of hurt, confusion, and low self-worth. Narcissists often devalue their partners when they feel threatened or challenged. This can happen when you express your own needs, opinions, or boundaries that don't align with their expectations. They may also devalue you when you don't provide them with c