What is chapter 5 from zachs lie about?

Chapter 5, "The Other Side of the Lie", explores how Zach's lie affects the people around him, including his family and friends. His girlfriend, Emma, is confused and scared by his sudden change in behavior, while his parents try to understand why he would do something so deceitful. The chapter also introduces new characters, such as Zach's former friends, who reveal more about his past and his motivations for lying.