ITS ALL ABOUT CONTROL!
The Narcissist/Jezebel wants to control their world and yours. They are usually very immature, selfish, and have an inability to compromise which will remind you of two years old child. The Narcissist first mission when they meet you is to learn you and they will try to learn everything about you. They act like a sponge just sucking up information about you and anything relating to you. They first appear under the guise of being your "best friend" and you open up and allow them to be but you only get sucked into a wormhole believing that you truly have found a best friend and it is mutual but that is not the case.
One integral element of a relationship is trust but a narcissist does not go into relationships trusting anyone. They enter relationships with preconceived worldviews that you can not trust anyone. The narcissist will keep infringing on your personal space and will be trespassing the boundaries that you placed just like all normal relationships. When you open up to them they will listen attentively to everything you tell them but they do not really share much about themselves and if they do share about themselves, its probably made up stories or twisted truth and lies in order not make them look like saints or victims in your own eyes.
The Narcissist is always testing you to see what you are made of, what you will condone, what you will tolerate, what you will allow, basically pushing your buttons to see what reaction they can get out of you; their object. You see the narcissist do not see you as a real person, they just see you as an object that they can toy with, control, manipulate, gaslight among other things. The narcissist worldview is 'trust no one but yourself' because they need to continually control their world and giving up that trust also means giving up control which is not on the narcissist's agenda.