Miley Cyrus has shocked fans by revealing her emotional break-up track “Slide Away” was written 18 months before she called it quits on her romance with Liam Hemsworth.The singer debuted the song after she and Liam ended their brief marriage last summer, but now she reveals it was written well before they became husband and wife.“I wrote Slide Away before my break-up,” she told Apple Music host Zane Lowe. “I wrote Slide Away in February of the year before.