Marriage 'Off The Cards' For Khloé Kardashian & Tristan Thompson Following Sydney Chase's Explosive Cheating Claims, Source Spills

They managed to rekindle their romance last spring, but with Tristan Thompson under fire — again! — for allegedly cheating on Khloé Kardashian, an OK! insider says the duo may be on the verge of another painful split. 

Since Instagram model Sydney Chase claimed last month that she had an affair with the NBA star in January (she later clarified that she and Thompson began seeing each other last November), Kardashian, 36, "has been devastated," dishes the insider.  

But Thompson, 30, who denies the claims and sent Chase, 23, a cease-and-desist letter to prevent her from divulging details of their alleged hookup, "is begging her not to feed into this nonsense." 

IS TRISTAN THOMPSON'S ALLEGED SIDE CHICK SYDNEY CHASE THROWING SHADE AT KHLOÉ KARDASHIAN? IG MODEL POSTS CRYPTIC MESSAGE ABOUT PROPER LOVE

The incident has "brought back Khloé's insecurities," adds the insider, noting that it took her a long time to forgive Thompson for his flings with Jordyn Woods in 2019 and another woman shortly before she gave birth to their daughter, True, 3. 

The drama began after Chase appeared on Adam22's "No Jumper" podcast with her BFFS — who call themselves The Blackout Girls. In the interview, which aired on April 22, Chase claimed she had an affair with the father-of-two. Later, she alleged that Thompson had reached out to her twice, even sharing dirty messages with her and telling her that Khloé is not actually his type.

IS KHLOÉ KARDASHIAN'S CRYPTIC IG MESSAGE ABOUT TRISTAN THOMPSON'S CHEATING RUMORS? 'KUWTK' STAR SAYS 'THINK HEALING, THINK HAPPINESS' 

Though the Revenge Body star has remained relatively tight-lipped amid Thompson's most recent scandal, Kardashian did take to Instagram earlier this week to share an inspirational — yet cryptic — message about positivity with her 143 million followers.