Some people with NPD may engage in manipulative behaviors, like gaslighting which is when someone makes another person question their own reality or even sanity. If a person is aware that they have NPD, they may be able to understand their own behavior during therapy. If they are not aware of their condition, they may have no idea that they are being manipulative. That being said, gaslighting is a form of control and emotional abuse. Individuals who are experiencing gaslighting in a relationship should consider seeking help and possibly leaving the relationship.