John Mayer: Famous Girlfriend Blues

John Mayer would prefer to talk about his guitar-playing, but what everyone really wants to know is how he's treating his woman, Jennifer Aniston. 'I've never cheated on anybody,' he assures Angus Batey. Portrait by Richard Phibbs John Mayer, his 6ft 3in frame crumpled into a utilitarian office chair in a side room off a warehouse-like rehearsal space in Burbank, California, sighs, half-smiles and briefly stops speaking. The 30-year-old guitarist, songwriter, singer, design er, sometime stand