"Nothing really [bad] happened," an insider explained to E! News. "They just barely saw each other in the past few months and it died out."
Kardashian and Harden were first linked in July, and continued to date after the reality star called off her divorce to estranged husband Lamar Odom. She clarified she and the 36-year-old former NBA player aren't romantically involved on The Ellen DeGeneres Show in November.
"I'm there helping him," she said of Odom's hospitalization. "It's definitely a very unique situation, to say the least. [James is] fine with it. I mean, we have to communicate a lot. And he's really supportive and great. I think the press and everything, they make it more complicated."
Kardashian took Odom on a hike with sister Kim Kardashian on Sunday, and was spotted with ex-boyfriend French Montana at Ace of Diamonds strip club the next day. She dismissed reconciliation rumors by re-tweeting, "Just because two people who were involved are seen together, doesn't mean they're back together."
Kardashian and Odom's divorce was pending with the athlete was discovered unconscious in a Las Vegas brothel in October. The former NBA star was in the hospital nearly three months before moving to a private facility in January.