…an ex-friend is someone who knew our deepest secrets and then vanished, someone we drove away or who chose to leave us. Often this person knows a self we have kept hidden from the rest of the world, a self we may have hoped to retire or pretend never existed. The passing of time or an expensive therapist may make us believe that we can erase an unpleasant past, but ex-friends are nagging reminders that this is a false hope. They know our history, and they remember it. And for this reason they haunt us.