Behavior before labels
The word narcissist is often used as shorthand for selfishness, cruelty, manipulation, or abuse. Narcissistic personality disorder is a clinical diagnosis that only a qualified professional can make. You do not need to diagnose someone to say no to intimidation, lying, humiliation, exploitation, financial control, coercion, or repeated contempt.
What to watch
Concerning patterns can include chronic blame-shifting, rewriting events, punishing disagreement, demanding special treatment, using affection as leverage, isolating a partner, sabotaging relationships, exploiting money or labor, and showing little interest in repair.
The boundary formula
A useful boundary contains three parts: the behavior, the limit, and the consequence. For example: 'I will not continue this conversation while I am being insulted. I am leaving now, and we can revisit it when the conversation is respectful.'
Do not debate reality forever
Some dynamics trap people in endless explanation. The goal becomes proving that your experience occurred rather than deciding what you will do next. When conversations repeatedly erase your reality, shift from persuasion to documentation and action.
When safety changes the strategy
If there is violence, stalking, threats, coercive control, or financial entrapment, direct confrontation may increase risk. Contact local domestic-violence resources, legal counsel, or emergency services as appropriate. Safety planning is not an overreaction.