immortal unwanted..

would somebody please define what immortality is? I often hear people that everyone seeks immortality in some way. some build cities. some build castles and some help or destroy parts of worlds so that they can be remembered. And for those who don't have the power to do that.. they simply have children to carry their name into the next generation and the next and the next. Some are remembered when they didn't even plan to be in the books of history. one way or the other on a scale grand or small, we all create immortals. But what do u do when u don't want some one to be immortal? what do u do when dont want someone to be remembered by YOU! how do u erase that person from your memory when all u can remember from that is the torture u've endured over the years of your life? how do u forget someone who isn't worth remembering???