Once upon a time, everyone was friends with everyone else. And no one fought. There were no arguments, no fights. There wasn't any hate between people. Everyone got along, and they held hands and sang songs and told each other stories.
But one day everything changed. A shadow came over the land, and darkness filled the hearts of the people. People started keeping secrets, fighting with each other, and people stopped being friends with everyone.
Now people aren't friends with everyone. There are fights and arguments, people betray and hurt others. Friendships die. And because this isn't a fairy tale, but real life, that's the way things will stay until people decide to live differently than they are.