LOS ANGELES: US pop star Justin Timberlake has broken up with girlfriend Jessica Biel. Justin’s family believes he was never committed fully to the relationship, reports dailymail.co.uk. “The girlfriends come and go, but we believe nothing has ever been serious,” his grandmother told a magazine. “Jessica was keen to marry, but Justin isn’t ready. He’s busy working hard to be successful - he’s really focused on that only,” she added.