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Khloé Kardashian Is 'Frustrated' by Rob's 'Lack of Respect for the Family' as He Dates Kylie's Nemesis Blac Chyna: Source

02/05/2016 AT 07:30 PM EST

Khloé Kardashian has always been her brother's biggest advocate throughout his struggles with depression and extreme weight gain, inviting Rob to live with her and defending him against her famous family's attempts at tough-love interventions.

"Rob is such a great guy," Khloé, 31, told PEOPLE in October. "He's charming, charismatic, everything. That's what's so infuriating. I'm like, 'Where is your will to live life? Let's be around people!' "

So it hurt the reality star when the person who seems to have given the push he needed to kickstart a healthy lifestyle turned out to be a Kardashian enemy: Blac Chyna, who was once engaged to and shares a son with their sister Kylie Jenner's boyfriend Tyga.

In this week's issue of PEOPLE, an insider says Khloé felt "betrayed" by the blossoming romance.



Khloé Kardashian Is 'Frustrated' by Rob's 'Lack of Respect for the Family' as He Dates Kylie's Nemesis Blac Chyna: Source| Couples, Keeping Up with the Kardashians, TV News, Khloe Kardashian, Rob Kardashian

Rob and Khloé Kardashian

Alexander Tamargo / Getty Images; Jeff Vespa / Getty Images for The Hollywood Reporter

"She has gone out of her way a million times to help him," the source says. "She always defended him."

For more on Rob Kardashian's relationship with Blac Chyna, her arrest and how the Kardashian-Jenner family is reacting, pick up this week's issue of PEOPLE, on newsstands Friday

Khloé Kardashian Is 'Frustrated' by Rob's 'Lack of Respect for the Family' as He Dates Kylie's Nemesis Blac Chyna: Source| Couples, Keeping Up with the Kardashians, TV News, Khloe Kardashian, Rob Kardashian

Amy Duggar on the cover of PEOPLE

Rob, 28, and Chyna, 27, took their romance public last week and have been demonstrating plenty of PDA on social media ever since.

As for Khloé, "She was frustrated by his lack of respect," the source says.
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