Rob Kardashian Admits He's Scared Blac Chyna Will 'Stop Being Attracted' to Him Because of His Weight

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Rob Kardashian fears that his weight could affect his relationship with Blac Chyna.

In a sneak peek of this Sunday’s episode of Rob & Chyna, the 29-year-old reality star admits to being scared that Chyna will no longer be "attracted" to him because of his weight gain.

Rob makes the confession when Chyna asks him why he skipped her party. "It's a combination of everything," explains Rob. "I just really didn’t want you to see me…and give you more reason not to be attracted to me or whatever. So I just didn’t want to go."

WATCH: EXCLUSIVE: Rob Kardashian Is 'Still Filming' Reality Series With Blac Chyna Amid Split Rumors, Social Media Absence

"When Rob says really bad stuff about himself, it kind of like throws me off a lot because I don’t see it," Chyna says to the camera. "And I get it, everybody’s down on themselves and has their opinion, but like some of the stuff he thinks and says, it’s really sad."

MORE: Rob Kardashian Apologizes to Blac Chyna, But Doesn't Want to Move Back in: Watch the 'Rob & Chyna' Clip!

While Rob's weight has been an issue for him in the past, the father-to-be credits his pregnant fiancee with pulling him through his "dark days," as he recently told People magazine.

"She got me through the toughest times," Rob admitted. "I wasn't happy in my own skin. I missed out on so many things."

The good news is, Rob appears to be in a much better place since this Rob & Chyna episode was taped. Despite a little trouble in paradise the engaged couple nevertheless seem to be doing well.

Meanwhile, are the two planning on relocating to the East Coast in the near future?

See how Rob created such speculation in the video below.