When you build a fence around your yard, you do not build it to figure out the boundaries of your neighbor’s yard so that you can dictate to him how he is to behave. You build it around your own yard so that you can maintain control of what happens to your own property. Personal boundaries do the same. If someone trespasses your personal boundaries in some way, you can take control of yourself and not allow yourself to be controlled, or hurt, anymore. This is self-control.
again, there are real limitations on how much you can let someone else hurt you; it would be more accurate to say “I will not give you the power to hurt me as much as I have in the past.”