Here it is:
You don't ever have to feel guilty about REMOVING TOXIC PEOPLE FROM YOUR LIFE. It doesn't matter whether someone is a relative, romantic interest, employer, childhood friend, or a new acquaintance - you don't have to make room for people who cause you pain or make you feel small. It's one thing if a person owns up to their behavior and makes an effort to change. But if a person disregards your feelings, ignores your boundaries, and "continues" to treat you in a harmful way, they need to go!
Perfect mantra for dealing with Ns.