Justin Bieber’s “essentials” include a journal, a Drew House hoodie and a book on how to keep his marriage “affair-proof.” If there’s anyone who doubts his faithfulness to his wife, Justin Bieber responded to Hailey Baldwin cheating rumors on Wednesday, January 22, when he posted an Instagram Stories photo of his essentials, which included the 2011 book His Needs, Her Needs: Building an Affair-Proof Marriage by Willard Hartley.