A teaser for Monday's episode of the reality show, which will air on Foxtel at noon, reveals the intimate moment Khloe found out about the tryst while showing Kylie telling her mother, Kris Jenner, that Jordyn "f**ked up".
It's only now set to appear on the show, which is delayed two months before airing.
The promo is extremely dramatic, with Kris heard saying, "This is going to change their relationship forever," referring to Kylie and Jordyn, before telling her youngest daughter: "For you and Jordyn, this is like a divorce."
We also see the heart-wrenching moment Khloe is told about the affair, with someone heard on speakerphone telling her: "I don't even know if I should tell you this …" before footage snaps to a different phone call where someone says: "Her legs were like, in between his legs."
Kylie can then be heard crying on the phone, saying: "The look in her eyes … She's just really going through it."
It's then clear she takes her big sister's side in the whole saga, telling Khloe: "Just know, I love you."
Jordyn, 21, allegedly hooked up with NBA star Tristan during a party while he was still dating Khloe who gave birth to their daughter True in April last year.
Reports suggest Jordyn, who was living with Kylie in her multimillion-dollar mansion, has moved out, and the pair rarely speak.
Sitting down with Jada Pinkett-Smith on her show Red Table Talk in March, Jordyn broke her silence on the scandal, saying Tristan kissed her, and she left straight away.
Exactly 28 minutes after it aired, Khloe hit Twitter, smashing Jordyn's heartfelt interview.
"Why are you lying @jordynwoods ?? If you're going to try and save yourself by going public, INSTEAD OF CALLING ME PRIVATELY TO APOLOGIZE FIRST, at least be HONEST about your story. BTW, You ARE the reason my family broke up!"
She later apologised and said it wasn't Jordyn's fault but hasn't addressed the scandal since.
It wasn't the first time Tristan was embroiled in a cheating scandal. He made headlines shortly before Khloe gave birth when he was caught on footage kissing a woman in a bar.