”I haven’t talked about it until now. I’m really nervous,” says actor Wes Bentley, chain-smoking outside a Los Angeles restaurant. Bentley was one of Heath Ledger’s closest friends. They costarred in 2002’s The Four Feathers and shared the same agent, along with a taste for mischief and a wariness of Hollywood’s star-making machinery. Even now, a year after Ledger was found dead in his New York apartment, it’s hard for Bentley to believe he’s gone.