When God Writes Your Love Story: The Ultimate Approach to Guy/Girl Relationships is a 1999 book by Eric and Leslie Ludy, an American married couple. After becoming a bestseller on the Christian book market, the book was republished in 2004 and then revised and expanded in 2009. It tells the story of the authors' first meeting, courtship, and marriage. The authors advise single people not to be physically or emotionally intimate with others, but to wait for the spouse that God has planned for them. The first edition was packaged with a CD single by the Ludys: "Faithfully", a song they had written specifically to accompany the book.