Things are heating up for Rob Kardashian and Blac Chyna.
On a new sneak peek of their reality show, Rob & Chyna, the daddy-to-be tries to go through his fiancée's phone after her text message alert repeatedly goes off, only to find that she changed the passcode.
MORE: Blac Chyna Makes Rob Kardashian Cry After Throwing His Gifted Flowers in the Pool!
"Who's this hitting your phone over and over?" Rob asks. "And your password's not the same as it was."
Chyna fires back at the reality star when she questions his trust in her, which prompts Rob to respond, "It's not about that — it's just that I don't get why you even care if I go through your phone.… I mean, don't you think that's shady?"
Further, the former model expresses her confusion with Rob's behavior, considering she's currently pregnant with her second child and takes care of her and ex Tyga's son King Cairo full-time.
MORE: Rob Kardashian Scolds Blac Chyna's Son King Cairo for Saying a Curse Word!
"I don't even understand why Rob would even think that I'm doing anything wrong," she says in the confessional. "I'm four months pregnant, I have two businesses that I'm running, I'm with King, and I literally don't leave the house. So what could I possibly be doing?"
Guess we'll have to wait for the series season premiere this Sunday to find out what happens!