Lamar Odom and Khloe Kardashian had one nasty split -- and Kim Kardashian is not thrilled the two are still on speaking terms.
In a preview clip for Sunday's episode of "Keeping Up with the Kardashians," we see Kim confront her sister after she gets off the phone with her ex-husband.
"I can't take it. The fact that when he decides to come around and be friendly, you're flirting with him," a clearly aggravated Kim says when Khloe hangs up the phone.
When Khloe asks how she's flirting, Kim says she's "Way more attentive" with Lamar than with fellow-ex French Montana.
"I don't know why Khloe and Lamar are talking, but he hurt her so badly," Kim says in a confessional. " "As a big sister, I'm protective. For her to just be flirting with him on the phone makes me sick to my stomach."
Do you see it as flirting? Check out Khloe's behavior in the video above.
The conversation between Kardashian and her ex is interesting, as the two seem to be pretty cordial.
Back in August, the duo made headlines when Lamar reportedly "ambushed" Khloe outside her SoulCycle class -- where he began shouting at her and put his hands on her shoulder before she told him to get away.
He claimed that the two had been communicating before the meeting, but sources in Khloe's camp said she hadn't spoken to him for weeks and she changed her number without giving him the new digits.
Wonder if we'll see this friendly camaraderie break down in the weeks to come!
Khloe recently opened up about their odd relationship in Women's Health, calling Lamar, "the love of my life."
"I love Lamar to death," she said at the time. "We had a fantastic marriage. Do I wish he had tried harder? Yes. Do I think that he maybe didn't have the energy to fight because he was fighting so many other things? Yeah.'