Kylie Jenner is having enormous trouble processing the revelation her best friend was involved in a cheating scandal with her sister's baby daddy ... and she doesn't know if her relationship with her BFF is worth saving.
TMZ broke the story ... Khloe Kardashian ended her relationship with Tristan Thompson for good after he allegedly hooked up with Jordyn Woods over the weekend ... making out with her at a house party.
Sources connected to the Kardashian klan tell us, at first Kylie didn't believe it but then, after doing some recon, it sunk in .