In a sneak peek at Sunday's season finale of "Keeping Up with the Kardashians," Kris Jenner, Khloe Kardashian and Kim Kardashian talk about Rob Kardashian, who suddenly dropped off the grid following a big fight with fiancee Blac Chyna.
"I'm trying to find Rob," Khloe says in the clip. "I've called him, texted him, he's not responding."
His family members aren't the only ones he's not speaking to though -- as Kris reveals even Chyna told her they haven't communicated since their blowout.
"I talked to Chyna. It scared me, because everything we experienced with him, she's experiencing the same thing," the momager explains, alluding to Rob previously cutting himself out of his family's life when things got rough.
Kim is quite the pessimist in this conversation, seemingly thinking the two are done for good by asking, "Is he ever gonna see his kid or is she gonna take it?"
In a confessional, Khloe reveals how concerned she really is about her brother, as she worries about him falling into deep depression again.
"I know when my brother hurts, how badly he does hurt," she says. "The more they're fighting and the longer things are bothering him, the more depressed he gets, he'll go into hiding again, he'll go missing. I don't want Rob to live that life anymore."
While Rob and Chyna have patched things up since filming this episode, it appears we'll really see what happened between them on their upcoming reality TV show. A preview for the upcoming series shows Kardashian's baby-mama-to-be freaking out over him "texting bitches" on the side.