A narcissist usually also constructs a massive ego so as to defend a shatteringly fragile self-esteem. It’s a fatal combination, consisting of manipulative charm and relentless cruelty. And this usually depends on the levels of abandonment or indeed abuse, they themselves may have experienced as children.
As a result of their trust issues, which will have emerged out of any emotional abandonment, they usually develop and expect unusual levels of loyalty from others. If it isn’t given freely, they can become very angry and disappointed. As a result, they may walk away from relationships – if they sense even the slightest disloyalty. Unfortunately, if they ever get confronted or if anyone disagrees with them, then this could also be construed as a form of betrayal.