New Tom Sturridge Interview - Explains why he won't discuss Rob

He refuses point blank, to talk about his girlfriend, Sienna Miller, or Robert Pattinson, his childhood friend.
"When you agree to be interviewed, it's an opportunity to review your own moronic-ness" he says. "It's OK if I come across as a complete idiot, but it's not fair for me to describe or refer to anyone else. Anyone can be tainted by my mention of them".

Thanks @Suffolk17