While Tristan is well known to have been unfaithful to the Good American co-founder in the past - including when she was nine months pregnant with baby True - the famous family are said to have been completely blindsided by Jordyn's treachery.
None more so than Kylie, who allowed the Instagram model to live in the guest house of her Calabasas mansion until news of the scandal broke.
Kylie and Jordyn's long and intense friendship - which saw them pledge commitment to one another in a Peruvian love ceremony and collaborate on a collection for Jenner's billion dollar brand Kylie Cosmetics - is allegedly damaged beyond repair.
The young mum, who shares one-year-old Stormi with rapper Travis Scott, reportedly took time out of filming season 16 of KUWTK to deal with the fallout of her 'wifey's' betrayal.
Later in the promo, Kim Kardashian is seen dabbing her eyes with a white tissue as she airs doubts about her future with husband Kanye West.
The KKW Beauty founder is worried about the rapper's desire to relocate to his hometown of Chicago, and admits it "might be my breaking point".
Kim and Kanye are currently expecting their fourth child via surrogate, a result of Kim's struggle with the life-threatening pregnancy condition placenta accreata.
They are already parents to five-year-old North, three-year-old Saint and one-year-old Chicago, known as Chi.
Supermodel sister Kendall Jenner is heard in voiceover clips speaking about her struggle with media intrusion into the family's daily life.
The notoriously private catwalk queen remarks: "Everyone feels they have the right to talk about you, even thought they have absolutely no idea what you're going through."
Mother-of-three Kourtney briefly appears in the trailer where she admits she has only been in love once in her life.
The camera instantly pans to her ex of eight years and father of her kids, Scott Disick, seemingly implying he is the subject of her confession.