At a PaleyFest event for “The Big Bang Theory,” actress Kaley Cuoco talks about her upcoming wedding to equestrian Karl Cook. (March 22) AP

As Big Bang Theory star Kaley Cuoco gets ready to walk down the aisle again, she’s reflecting on what went wrong the first time she said, “I do.”

In an interview with Cosmopolitan, which has her as their April cover star, Cuoco said that her ex, tennis player Ryan Sweeting, “completely changed” after the two wed. (Which sounds like it probably was a worse offense than being a bad tipper, as one of her mystery exes…