This real-life Titanic passenger’s heart did go on — in a century-old love letter. James Cameron’s 1997 blockbuster “Titanic” famously revolved around the romance between Leonardo DiCaprio’s Jack Dawson and Kate Winslet’s Rose DeWitt Bukater — two fictional characters created by Cameron himself. But now, a never-before-seen letter has revealed that there actually was a passenger aboard the boat pining over a woman named Rose. Ernest Tomlin, a 21-year-old third-class passenger, boarded the