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It's as if the Kardashian family has a time machine. On Sunday night, there was Kylie Jenner being all BFF with Khloe Kardashian's ex French Montana, as if they were all one big, happy family.

Just two nights prior, Kourtney Kardashian was hanging out with her ex Scott Disick in Las Vegas. The parents to Mason, Penelope and Reign were in Vegas together two weeks prior to that with, as well, with Khloe and Tyga, Kylie's ex.

What is it about this family that they can't seem to let go of either their own exes or the former lovers of their siblings?

"We have history and we've had a relationship and great friendships and I love that we are still friends," Khloe told Kylie Radio, adding, "We had a great relationship and I like that we can still be friends."

The friendship obviously spills over into the rest of the family, too. Over the weekend, Kylie and French hung out in Los Angeles, and the rapper even surprised Kylie by buying her roses.

While in his car, French saw a woman selling flowers on the street and purchased roses out the window of his car and gave them to Kylie.

"Aww, French, stop," Kylie says in the Snapchat video. "Stop!"

French grins after his purchase.

As for Scott and Kourtney, it's a little different, as they share children together. Still, he's often seen hanging out with Kardashian-Jenner family members. In May, he was spotted in Cannes with Kris Jenner and Kendall Jenner, escorting them around Paul Allen's yacht party.

On Scott's birthday, the family showered him with social media love (remember, he's not dating Kourtney anymore!).

"Happy Birthday Scott!!" Kris captioned a medley of pictures of him. "Thank you for being a loving and devoted father to my beautiful grandkids. I am so blessed to be able to call you my son. I love you and hope you have the most amazing day! @letthelordbewithyou #love #family #proudmama #happybirthdayscott."

Six months ago, long after Khloe and French split, Kourtney was seen hanging with the "Pop That" rapper at Diddy's birthday bash.

Clearly this family doesn't know how to move on, nor do they apparently want to.