The pair's romance came to a halt after the actress could not cope up with Cavill's casanova image, reported Showbizspy.
"Henry's a ladies' man. And even though Kaley and Johnny Galecki broke up three years ago, they've remained really close pals. Johnny was worried for her and thought Henry wasn't being genuine," a source said.
Cavill was engaged to champion horse jumper Ellen Whitaker before dating Gina Carano. Later he crossed paths with Cuoco this spring.