We Are Worried About Rob - Kardashian Sisters Reveal In New Sneek Peak

Blac Chyna texted all of Rob Kardashian's famous sisters to say she's going to leave him, according to Sunday's new Keeping Up With The Kardashians.

The drama between Rob, 30, and Blac, 28, seems to be taking center-stage in the E! show, as seen in a sneak peek on Tuesday.

'Rob and Chyna got into a big fight,' explains his sister Kim, adding: 'We're all worried about Rob.'

The on-off couple have repeatedly split, after a series of explosive arguments.

They are reportedly currently back together.

In the teaser for the show, Kim, Khloé and Kylie Jenner are seen chatting on FaceTime with their brother.

Khloé, 32, informs him that Chyna has been threatening to break things off with him.

'She texted all your sisters and said that she's ready to leave you,' says Khloé, 32.

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But Rob isn't giving up that easily: 'I definitely do love her and want to be with her,' he says.

'Am I crazy?!' demands Khloé in response. 'What does that mean?'