A source tells E! Online it's over after a handful of dates. It's the second time the two have gone through break ups this year: Cavill broke up with Gina Carano and Cuoco split from Pepper bassist Bret Bollinger.
The two certainly appeared to be fans of one another - Cavill had previously confessed he was a fan of Cuoco's work on television and said he "always wanted to date her" and Cuoco tweeted a photo of herself fawning over Cavill's movie poster.
Those rooting for the couple will hope this is just a ploy to keep away the sudden explosion of media attention on them, but it looks like it's over for real.