Narcissists are motivated by what you think of them
All of us experience jealousy from time to time, but narcissists take it to a much darker level. A narcissist can be so envious of others that he resents other people for being happy and well-off. He will routinely put other people down to make himself seem superior.
Without unceasing attention and admiration from others, the narcissist feels insignificant. He requires incessant adulation to heighten his own sense of self-importance.
A narcissist’s behavior is often motivated by this deep-seated desire to be worshiped by others. If a narcissist is not at the center of attention, or feels he is not being adequately venerated and exalted by others, he might react with narcissistic rage. His actions are intended to control and manipulate others, so they will cater to his every whim and desire.