Narcissists lack empathy and their only way to behave in intimate relationships is through lies, manipulations, neglect, gaslighting… you name it. They only think about fulfilling their own selfish needs. They don’t care about anyone else.
And it is not that they can’t feel any emotions. They can, but they are shallow and short-lived. In fact, I think it is safe to say that they don’t even love themselves even though it may seem like it.
The only thing they want more than anything is attention. They will do everything they can to always be in power and in control. They manipulate you, they destroy your self-confidence, they make you powerless only to rule you.