Getting Closure in Relationships

Closure seems to be as difficult to find in some cases as the holy grail. People seek closure from relationships so they can move on and let go of the past. So many say they need closure from their relationships. But do they really need closure or do they 'need' it as a way to keep obsessing about an ex? Do you really need someone else to give you closure? Why can't you find that closure from within yourself? So, what is it exactly that you need to get closure? Is the path to closure right in front of you yet you are refusing to take the necessary steps to achieve it? If someone has closed the door on your relationship, by ending it or being with someone else, this should be enough closure for you to move on with your life.