The source described the couple as "miserable," saying, "The few times Kaley and Ryan were out together recently... You could tell the honeymoon phase had ended."
Kaley and tennis star Sweeting confirmed their split on Friday.
The news came just weeks after Kaley posed for the cover of Shape magazine.
Cuoco opened up about Sweeting in the article, but only in terms of their eating habits. She said, “As I’ve gotten older, I’ve had to change my food intake. My husband, Ryan [Sweeting, a professional tennis player], eats so much. When we first got married, it was so much fun to eat like him. We got into this habit we called the bedtime snack. The drawers next to the bed were filled with candy. Eventually, I realized it was mindless eating. I was just doing it because he was doing it, and it was adding hundreds of calories I didn’t even think about. So I cut that out. Our refrigerator and pantry have completely changed, because we don’t eat crap anymore. No more soda, chips, cereal; we had boxes of stuff that only a 4-year-old would eat.”