It was very early on in the show" (viaET Online).
She admitted she had a huge crush on theChristmas Vacationstar beginning when they taped the pilot.
Things ended amicably, but that doesn’t mean continuing to film the show together was without awkwardness.

We’re closer today than we ever were, but I just remember [show creator] Chuck Lorre… As fans know, Penny and Leonard would eventually get married onThe Big Bang Theory(viaPeople).
But Cuoco and Galecki are just friends…who dated for more than a second.
As Galecki has said, “We’re dear friends, still.

Kaley’s not just an ex, she’s a part of my life.
It was a wonderful relationship” (viaFox News).
If I was with him, I would ask him because that came out of nowhere.
All of a sudden these characters were all up on each other."
Perhaps we will never know if Cuoco’s theory is based in reality.
But it is fun to wonder!