Cavill and Cuoco split up last month following a brief romance and friends of the 27-year-old actress said the relationship was difficult for her, reports contactmusic.com.
"She just got overwhelmed with the very public Superman relationship. She's not used to that much attention and chaos in her life," a source told OK! Magazine.
"The Big Bang Theory" actress has now moved on to tennis player Ryan Sweeting and is much happier with this low-key romance.
"She thinks Ryan's a really hot, nice guy. It's nice that he's not really an industry guy," added the source.