def remove_friendship(user)
      friendship = find_any_friendship_with(user)
      return false if friendship.nil?
      friendship.destroy
      self.reload && user.reload if friendship.destroyed?
      true
    end
def remove_friendship(user)
      friendship = find_any_friendship_with(user)
      return false if friendship.nil?
      friendship.destroy
      self.reload && user.reload if friendship.destroyed?
      true
    end
deletes a friendship