Egotism actually reigns over you and push you to do the things to save itself. As a result, Narcissism, Anger, Jealousy, Greed, and the other demerits sprout in your mind. In short words, "Death doesn't kill you, It's your Ego who do." In other words, Egotism keeps you away from your original self.
Narcissism is something which is already present in every human. It then develops with time and life experiences. A little child has also some feelings of Narcissism because he observes the things around him very sharply and the Narcissism is everywhere in the present world.
According to nature, If there's one thing is present, then the other is absent. If there's light, there's no dark. Only one thing can be present in a particular place. Either you are Narcissist or extremely negative person about yourself (Both are same) or you love yourself completely. One thing is present in you and one is absent. But the Focus inside you remains the same.
Positivity and Egotism are similar to Self-love and Narcissism respectively to some extent. In Self-love, we are Positive about ourselves and the actions we commit. While being Narcissist is common as Egotistical.
the Slash itself is a trap which deludes us with its white innocent bright light, which in fact is a mirage. We step forward towards this and cross the line and eventually, enter into the world of Narcissism in a hope that this phase would much happier place than the previous one.