News Gillian Anderson Splits with Longtime Boyfriend Published 5:48 PM PDT, August 7, 2012 Photo: Getty Images After six years of dating, Gillian Anderson and Mark Griffiths are calling it quits. RELATED: David Duchovny & Tea Leoni Split A rep for the 43-year-old X-Files star confirmed the news to US Weekly, stating that she and her partner have separated "amicably." The couple shares two children: Oscar, 5, and Felix, 3. Before dating Griffiths, Anderson was previously married to director Clyde Kotz. The actress later wed filmmaker Julian Ozanne, divorcing just two years later.