It's proper to be honest when ending a friendship.
Charlie realized that his childhood friend has become a toxic relationship.
Charlie wants to stop interacting with his friend.
Charlie explains to his friend that they have grown apart and should spend some time apart.
Charlie lets his friend believe that he is moving out of town to avoid hanging out.
Charlie's friend understand and stops trying to hang out with Charlie.
Charlie's friend sees him at a bar a week later and is hurt that Charlie lied.