Why might someone with narcissistic traits react with hostility when their partner asserts independence?

How do narcissists justify discarding someone who was once important to them, and what does it mean for their sense of self?
Do you think most men today are still too afraid to try a professional manicure?
How do highly intelligent people handle social situations if they approach problems and ideas differently than others?
What is one painful truth about life that nobody warned you about, but you had to learn the hard way?