Mariah Carey has opened up about having an affair with New York Yankees baseball legend Derek Jeter while she was married to Tommy Mottola.The musician writes about the affair, which was rumoured for years, in her upcoming memoir, The Meaning of Mariah Carey.In the book, Carey writes that the affair with Mottola happened in the 1990s after they met at a dinner party and secretly began “text flirting”.The singer reveals how her first meeting with Jeter took place on the rooftop of his New York