American Idol star Simon Cowell has reportedly broken up with his longtime girlfriend, model Terri Seymour. The former happy couple had been dating for more than six years, but they are now said to have broken off their relationship after drifting apart over the last few months. According to the British newspaper the Daily Mirror, the beauty recently told friends,"We've split up. It's very sad but we decided to go our separate ways. It just wasn't working out between us. There's no one else involved and we want to remain friends." The couple has made no secret of their differing views on marriage and children, with Cowell insisting that he will never settle down, while Seymour confessed her longing to start a family. The reports were further fueled when Cowell turned up to the National TV Awards in London last Wednesday night with another woman on his arm, his ex-fiancee and former pop protegee, Sinitta.The two have remained close since their split, with Cowell bringing Sinitta on board to help him mentor his group of contestants on British reality show "The X Factor."