Here are links to 5 articles, from PsychCentral's archives, that hopefully may be of some help with putting the situation you describe into perspective:

What's a Toxic Person & How Do You Deal With One?

Toxic People: You Don't Need Permission to Walk Away

5 Ways to Maintain Boundaries with Difficult People

8 Ways to Detoxify Toxic People | Childhood Emotional Neglect

How to Prioritize Your Needs, Set Boundaries, and Take Care of Yourself without Feeling Guilty – Happily Imperfect