"He said he wasn't feeling it anymore," an insider said. "She's still very brokenhearted."
No more specific reason was given for the split.
The magazine said King and her young son with her ex-husband Ian Alexander Jr. have moved out of the house they shared with the former "Cosby Show" star.
King leads the cast of the Los Angeles-set police drama "Southland." She also starred in the 1980s sitcom "227."