Johnny Galecki talks about secret relationship with 'Big Bang Theory' co-star Kaley Cuoco

Following Kaley Cuoco’s whirlwind engagement to tennis player Ryan Sweeting, and their mock wedding on The Ellen DeGeneres Show, her ex-boyfriend and Big Bang Theory co-star Johnny Galecki is finally speaking out about their secretive relationship.

Galecki told CBS Watch! Magazine that they were secretive about their nearly 2-year relationship because they wanted to protect their role on the hit CBS show.

"We're dear friends, still. Kaley's not just an ex, she's a part of my life... I just don't like to speak about it,” he said, ABC reports. “And not because I'm trying to be enigmatic; I just worry that it will conflict with people's acceptance of (our characters) Leonard and Penny. I get the curiosity, but I don't want to distract from the story."

Us Weekly notes that Cuoco talked about it for the first time to CBS Watch! Magazine back in 2010. "We dated for almost two years. It was such a huge part of my life and no one knew about it," she said. "This is the first time I've ever talked about it, ever. It was a wonderful relationship, but we never spoke a word about it and never went anywhere together."

She continued, "[We were] so protective of ourselves and the show, and we didn't want anything to ruin that.”

Cuoco and her fiancé, Sweeting, participated in a wedding on Ellen on Thursday.

image: CBS

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