It was over before it was revealed. The Big Bang Theory costars secretly dated for two years in the first few seasons of their CBS comedy. In September 2010, Cuoco -- who married tennis pro Ryan Sweeting on New Year's Eve in 2013 -- opened up about the relationship for the first time in CBS Watch! Magazine. "It was a wonderful relationship, but we never spoke a word about it and never went anywhere together," she said. Galecki told the mag in December 2013 that the two were still friends. "Kaley's not just an ex, she's a part of my life."