Keeping things separate? Blac Chyna is confused in Rob & Chyna's Sunday, October 2, episode about why she hasn't met fiancé Rob Kardashian's friends, as seen in Us Weekly's exclusive sneak peek. 

The E! series' preview clip shows Scott Disick telling Chyna that they should plan a barbecue for the Arthur George sock designer. The pregnant makeup maven replies, "Not another barbecue," although she is OK with a "get-together." (Rob and the model got engaged in April, and she is expecting their first child, a baby girl, later this year.)

"Do you think it should be a surprise?" Chyna, 28, asks Kourtney Kardashian's ex-boyfriend. "Because I feel like Rob always gets nervous and chokes up when he's around a lot of people."

Disick, 33, replies, "Everyone needs to start spending time together. I feel like he's got all these friends that he grew up with that you don't even know. They keep calling me, like, 'Why haven't I met Rob's future wife, the mother of his child?'"

Chyna points out it's certainly unusual that her beau, 29, hasn't introduced her to more of the people who are important to him.

"I don't know none of Rob's friends, and that's just different," she tells the camera.

The couple have had their share of tension throughout this season of the reality series. During last week's episode, Chyna's mom, Tokyo Toni, warned Rob that he may "ruin" the relationship if he continues causing drama.

On Monday, September 26, Rob tweeted out younger sister Kylie Jenner's phone number. This was in apparent retaliation for his family not inviting Chyna to a baby shower to celebrate the Rob & Chyna duo's soon-to-arrive bundle of joy.

Watch the tense clip in the video above. Rob & Chyna airs on E! Sundays at 9 p.m. ET. 

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