Jordyn has been living with Kylie and playing 'Auntie Jordyn' to baby Stormi for a long time now, so this would have been a huge blow to both of them. But, it's necessary.
Now, Jordyn is "moving back to her mom's house," says an insider. "It's been a difficult time and she's broken up about it. She's heading home to be with her mom."
Other sources have previously confirmed to People the KarJenner fam was "blindsided" by the reports about Jordyn's betrayal.
"When they first started hearing on Monday that Tristan made out with Jordyn, no one really believed it," said one source. "That Tristan would be inappropriate, yes everyone knows that he can’t behave, but that Jordyn would make out with him, it first seemed like a made up rumour."
"It wasn’t anything they wanted to drop," the source added. "So several family members reached out to people they believed had been at the party. And they were told it was true."
The news is hardest on Khloe, but the entire family are completely shook by the news.
"It’s all a mess now. Everyone considered Jordyn family. She was like a family member and always invited everywhere," the source said.
"The family helped her and wanted her to be able to have a business venture too."
As for the future of Kylie and Jordyn's friendship... it's uncertain for now.
"Jordyn has been like Kylie’s sister. They were inseparable, and always together," the source said. "Jordyn often helped Kylie with Stormi. Kylie was always so excited to have Jordyn around. It seems Kylie isn’t sure what to do, but it seems impossible for her to keep Jordyn around."
Oh Jordyn, you had it all.
Watch below... Khloé Kardashian Steps Out for the First Time Following Allegations Tristan Thompson Cheated: