[kespindler]

"Laws of Human Nature" by Robert Greene (ironically, also the author of 48 laws of power, which is often criticized for advocating machiavellianism) is an extremely powerful book.

It has two chapters that are especially relevant for you: "Chapter 2: Transform self-love into empathy: The law of narcissism", which might be self-evident in its value from the title, and "Chapter 4: Determine the strength of people's character: The law of compulsive behavior", which discusses toxic personality types, how to avoid them, and what to do in case you notice those patterns in your own behavior. I think you'll find both of those chapters extremely illuminating.

The whole book is worth checking out too. And a relationship with a good executive coach or therapist works wonders too!