When do you decide it is time to move on and get on with your own life?

Does it have to depend on another person (a relationship)? That person doesn't have the right to dictate what you want to do in your life, right? They only can have some sort of input. Does this input have to depend on how close you are in the relationship. If you are "just friends" you should be able to move on without much chaos and heartache, right?