Having boundaries is an important part of emotional intelligence. Boundaries are how you keep toxic people out of your life. At the same time, however, it can be hard to enforce those boundaries. Humans are social animals; we have an instinctive desire to cooperate and to get along. But there are people who exploit those desires for their own ends. Users and abusers, parasites and emotional vampires, bullies and all-around assholes are all people who will take advantage of people who don'...