"My life with One Direction has been more than I could ever have imagined," he wrote. "But, after five years, I feel like it is now the right time for me to leave the band. I'd like to apologise to the fans if I've let anyone down, but I have to do what feels right in my heart."
Malik returned to the U.K. amid rumors he cheated on fiancée Perrie Edwards while on tour. The singer was recently photographed cozying up to a mystery woman after a concert, but subsequently dismissed infidelity reports on Twitter.