Kourtney Kardashian says it's "never going to work out" with her former partner Scott Disick.
"It's never going to work out," she says in the promo.
The teaser sees Disick call Kardashian the "love of [his] life," but also proclaim himself a "sex addict" after bringing a woman on a trip with the star's family.
It also features footage of Kardashian's sister Kim Kardashian crying over her Paris robbery and husband Kanye West's hospitalization.
"He walked off stage after three songs," the 36-year-old star says of West's breakdown in November.
Kardashian and Disick, who share 7-year-old son Mason, 4-year-old daughter Penelope and 2-year-old son Reign, split in 2015 after nine years of dating.
The pair appeared to reconcile in December, and enjoyed an Aspen getaway with their kids the next month.
"[Kourtney and Scott] are stronger and healthier as a couple than ever before," a source told Hollywood Life at the time.
"[Kourtney] has a lot of strong feelings for Scott and she is enjoying having him around," the insider added.
"She sees how much happier their children are when he's around, so she is being patient with Scott and trying to be forgiving of his rocky past."
"Keeping Up with the Kardashians" will premiere a 13th season Sunday, March 12.