Demi Lovato has released a new single that reveals a heartbreaking setback in her road to recovery from addiction. Demi Lovato opens up about relapse in candid single \’Sober\’ 21 JUN 18 16:11 ET By Sandra Gonzalez, CNN     (CNN) — Demi Lovato has released a new single that reveals a heartbreaking setback in her road…… MORE