In  the book  Lush by Natasha Friend, from the beginning to the end Sam (the main characters) and Charlie's (Sams friend) realationship changed. In the beginning Sam and Charlie didnt get along and were mad at each other. Then at the end they were closer friends but still not as close as they were when they were younger. I think the relationship was better at the end because they were friends again. Thats how the relationship changed from the beginning to the end in the book Lush by Natasha Friend.