Invalidation is the product of an absence of empathy, hence being a natural space for the pathological narcissist to operate from. It is the act of purposefully denying, rejecting, minimising, negatively judging, and/or ignoring your expressed experience, thoughts, actions, or emotions.

Why do narcissists discard you?

The narcissist sees people as objects they use to meet their needs, and to discard when the person no longer serves a purpose for them. A narcissist will discard when the person no longer can boost the narc's ego or be the fuel to replenish their narcissistic supply.

Why do narcissists start to devalue?

Narcissists usually idealise their partner in the beginning of a relationship, when they are feeling special and admired and getting narcissistic supplies. ... To avoid the deflation of their self-esteem, they devalue their partner by finding fault in them, to boost their own self-esteem.