Most narcissists hate being on their own for long. And although they might not admit it, they need people more than most do. Narcissist don't like being vulnerable. So they don't want you to know how much they need you. Otherwise you might realise you have more power than them. And they can't have that.
Not all narcissists are the same, although all can have a devastating effect on your life. One in particular can be especially dangerous. One of the reasons it's important to understand that there are different types is that if you know a person who doesn't quite fit all the characteristics of something you've read, it may be easy for you to convince yourself (or your partner to convince you) that you're imagining how bad things are. #narcissisticabuserecovery