 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 . 
