What is the difference between a narcissist and a selfish person?

What is the difference between a narcissist and a selfish person? In other words, while someone who is selfish, self-centered, or self-absorbed may talk about themselves too much or forget things that are important to you, the key difference is this: When you explain to a narcissist that your feelings were hurt or they let you down in some capacity, the narcissist will not apologize.

In other words, while someone who is selfish, self-centered, or self-absorbed may talk about themselves too much or forget things that are important to you, the key difference is this: When you explain to a narcissist that your feelings were hurt or they let you down in some capacity, the narcissist will not apologize.