Arians doesn’t know why Steelers let him go, says Ben is unhappy

Former Steelers offensive coordinator Bruce Arians has confirmed that the “retirement” the team announced last week was actually a departure forced by the team. And he says Ben Roethlisberger is not pleased. Arians says Steelers owner Art Rooney II didn’t offer him a contract for the 2012 season and wouldn’t tell him why. “I can’t…