Kim and Khloe Kardashian reveal what they wish Rob had said to them before dating Blac Chyna

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Blac Chyna the Reason for Rob's Transformation?

In the upcoming episode of "Keeping Up with the Kardashians," Kim and Khloé Kardashian discuss how torn they are about their brother, Rob's, romance with family enemy Blac Chyna.

Though the sisters are happy that Rob has finally ended his spiraling hideaway from the world that included a massive weight gain and allegedly endless partying, they're not sure how to feel about the fact that the person that got him out of his slump is none other than Chyna who, in Khloé's words, "is Tyga's ex and Kylie is dating Tyga now."

SEE ALSO: Kim Kardashian is receiving the first-ever 'Break the Internet' Webby Award

"Rob, who doesn't even show up to Christmas for the past three years and literally wouldn't leave his room, [...] created a Snapchat [and] now he wants to be so public," Khloé explains to Kim in the clip. "The fact that he wants to be so public blows my mind."

Kim echoed Khloé's astonishment about their brother's social media presence, noting: "Rob is now, like, all over social media and out and about. He hasn't been like this in so long that, even though there's some drama, if this is what it takes -- I don't care who he's dating -- I am so happy that he's just feeling better about himself."

But, just because he's happy with his new girlfriend and living a seemingly healthier life, doesn't mean that he didn't do anything wrong in his sisters' eyes. According to them, Rob never once sat them down and explained his situation. He never explained that, even though he knows that Blac Chyna isn't exactly beloved by their family, he can't help who he falls in love with.

See Rob and Chyna's relationship:

23 PHOTOS
Rob Kardashian and Blac Chyna together
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Kim and Khloe Kardashian reveal what they wish Rob had said to them before dating Blac Chyna
NEW YORK, NY - APRIL 14: Rob Kardashian and Blac Chyna are seen on April 14, 2016 in New York City. (Photo by XPX/Star Max/GC Images)
NEW YORK, NY - APRIL 14: Rob Kardashian and Blac Chyna are seen on April 14, 2016 in New York City. (Photo by XPX/Star Max/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Rob Kardashian and Blac Chyna at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
LOS ANGELES, CA - APRIL 18: Rob Kardashian and Blac Chyna are seen at LAX on April 18, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 26: Kim Kardashian, Rob Kardashian, and Blac Chyna are seen on April 26, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 26: Kim Kardashian, Rob Kardashian, and Blac Chyna are seen on April 26, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna are seen at LAX Airport in Los Angeles, Ca on March 14, 2016 in Los Angeles, California. (Photo by Light Brigade/Bauer-Griffin/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Rob Kardashian and Blac Chyna at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna is seen at LAX on March 14, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
ROB & CHYNA -- Season:1 -- Pictured: (l-r) Rob Kardashian, Blac Chyna -- (Photo by: Tommy Garcia/E! Entertainment/NBCU Photo Bank via Getty Images)
LAS VEGAS, NV - MAY 28: Television personality Rob Kardashian (L) and model Blac Chyna attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
LAS VEGAS, NV - MAY 28: Model Blac Chyna (L) and television personality Rob Kardashian attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
LAS VEGAS, NV - MAY 28: Television personality Rob Kardashian (L) and model Blac Chyna attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
HOLLYWOOD, CA - MAY 10: Blac Chyna and Rob Kardashian attend Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - MAY 10: Blac Chyna and Rob Kardashian attend Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - MAY 10: Rob Kardashian and Blac Chyna arrive at her Blac Chyna Birthday Celebration And Unveiling Of Her 'Chymoji' Emoji Collection at the Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by Greg Doherty/Getty Images)
HOLLYWOOD, CA - MAY 10: Blac Chyna (L) and Rob Kardashian arrive for her Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe, Hollywood, CA on May 10, 2016 in Hollywood, California. (Photo by Gabriel Olsen/WireImage)
HOLLYWOOD, CA - MAY 10: Rob Kardashian and Blac Chyna arrive at her Blac Chyna Birthday Celebration And Unveiling Of Her 'Chymoji' Emoji Collection at the Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by Greg Doherty/Getty Images)
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"My thing is, do what you want [and] do what makes you happy," Kim says to Khloé. "But he should have said to us, 'Hey guys, this is how I feel. I can't help who I love and I fell in love with her, but Kylie should know this.'"

"He just has no loyalty," Kim concludes.

Kim may feel slighted by Rob's lack of explanation and lack of consideration for his family's feelings, but it's Khloé who feels especially slighted by his new relationship and actions. After all, Rob lived with Khloé throughout his downward spiral, and she was the only person who truly stood by him throughout his troubled two years.

"Am I happy he's out and about? For sure," Khloé muses during her confessional. "Am I disappointed that Rob isn't talking to me now that he's out of my house? Yeah, because I've been the only one that stood by him and defended him and wanted the best for him. So that's where it gets frustrating."

In the end, though, the sisters understand that it's not really about them. It's about Rob and his happiness. And, right now, he appears to be happy.

"She gave him confidence," Kim says of Blac Chyna. "More power to her!"

Related: See the evolution of the Kardashian/Jenner family:

26 PHOTOS
The evolution of the Kardashian/Jenner clan
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Kim and Khloe Kardashian reveal what they wish Rob had said to them before dating Blac Chyna
With his son Burt on his shoulders, American former professional athlete Bruce Jenner walks around the dirt race course during a break in the First Off-Road Championship Grand Prix in the Los Angeles Memorial Coliseum, Los Angeles, California, June 24, 1979. (Photo by Bob Riha, Jr./Getty Images)
LOS ANGELES - 1991: (Middle row, L-R) Brody Jenner, Kourtney Kardashian, Bruce Jenner, Kris Jenner, Cassandra Jenner, Kim Kardashian, (top row, L-R) Brandon Jenner, Burton Jenner,(bottom row, L-R) Robert Kardashian, Jr., Khloe Kardashian of the celebrity Jenner and Kardashian families featured in the TV show 'Keeping Up With The Kardashians' pose for a family portrait in 1991 in Los Angeles, California . (Photo by Maureen Donaldson/Michael Ochs Archives/Getty Images)
LOS ANGELES - 1993: (clockwise from top left) Burton Jenner, Khloe Kardashian, Bruce Jenner, Kris Jenner, Kim Kardashian, Brandon Jenner, Brody Jenner, Kourtney Kardashian, Robert Kardashian, Jr. and Cassandra Jenner of the celebrity Jenner and Kardashian families featured in the TV show 'Keeping Up With The Kardashians' pose for a family portrait in 1993 in Los Angeles, California . (Photo by Maureen Donaldson/Michael Ochs Archives/Getty Images)
Bruce Jenner, Kendall Jenner and Kris Kardashian during World Premiere of 'Mulan' at Hollywood Bowl in Hollywood, California, United States. (Photo by Ron Galella, Ltd./WireImage)
HOLLYWOOD, CA - DECEMBER 10: Bruce Jenner, Kris Jenner, Kendall Jenner and Kylie Jenner attend the world premiere of 'The Emperor's New Groove' on December 10, 2000 at the El Capitan Theater in Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
Bruce Jenner and wife Kris with daughters Kylie and Kendall (Photo by Cesare Bonazza/WireImage)
LOS ANGELES - JULY 29: Musician Brandon Jenner performs with his band Big Dume at Best Buy West Los Angeles on July 29, 2005 in Los Angeles, California. (Photo by Amanda Edwards/Getty Images)
LOS ANGELES, CA - OCTOBER 10: Kris Jenner, Kourtney Kardashian, Kim Kardashian and Khloe Kardashian attend Nick Cannon's Birthday celebration and opening of the PNB Nation store on October 10, 2006 in Los Angeles, California. (Photo by Chad Buchanan/Getty Images)
Kylie Jenner, Kim Kardashian and Kendall Jenner (Photo by Jeff Vespa/WireImage)
Brody Jenner arrives at the MTV Movie Awards on Sunday June 1, 2008 in Los Angeles. (AP Photo/Chris Pizzello)
LOS ANGELES, CA - SEPTEMBER 25: Scott Disick (L) and TV personality Kourtney Kardashian attend 'Rock The Vote' Hosted by Christina Aguilera held at the Esquire House Hollywood Hills on September 25, 2008 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images for Esquire )
From left, television personalities Kim, Kourtney and Khloe Kardashian participate in the 2nd Annual DirecTV Celebrity Beach Bowl presented by Spike, Thursday, Jan. 31, 2008 in Scottsdale, Ariz. (AP Photo/Evan Agostini)
Brody Jenner arrives to the 6th Annual Hollywood Style Awards on Sunday Oct. 11, 2009, in Los Angeles. (AP Photo/Katy Winn)
Reality stars Kim Kardashian, Kourtney Kardashian and Scott Disick attend the Jill Stuart Spring 2011 collection during fashion week at Lincoln Center, in New York, on Saturday, Sept. 11, 2010. (AP Photo/Peter Kramer)
EXCLUSIVE CONTENT - PREMIUM RATES APPLY Burt Jenner, Bruce Jenner, Brody Jenner and Brandon Jenner at Brody Jenner’s 30th Birthday Celebration with Stoli held at Aventine on August 21, 2013 in Los Angeles. (Photo by Alexandra Wyman/Invision for Stoli/AP Images)
LAS VEGAS, NV - SEPTEMBER 21: (L-R) TV personalities Kendall Jenner, Khloe Kardashian, Kourtney Kardashian and Kylie Jenner attend the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images for Clear Channel)
LOS ANGELES, CA - APRIL 05: Musicians Brandon Jenner (L) and Leah Felder attend the 2nd Light Up The Blues Concert - An Evening Of Music To Benefit Autism Speaks at The Theatre At Ace Hotel on April 5, 2014 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images for LUTB)
Burt Jenner speaks during a news conference after winning the SPEED Energy Formula Off-Road race before the IndyCar Detroit Grand Prix auto racing doubleheader Sunday, May 31, 2015. (Photo/Paul Sancya)
LOS ANGELES, CA - APRIL 23: TV personalities Scott Disick (L) and Kourtney Kardashian attend Opening Ceremony and Calvin Klein Jeans' celebration launch of the #mycalvins Denim Series with special guest Kendall Jenner at Chateau Marmont on April 23, 2015 in Los Angeles, California. (Photo by Chris Weeks/Getty Images for Calvin Klein)
Brody Jenner arrives at the LA Premiere Of "Entourage" at the Regency Village Theatre on Monday, June 1, 2015, in Los Angeles. (Photo by Rob Latour/Invision/AP)
FILE - In this June 24, 2015 file photo, American television personality Kim Kardashian poses for photographers as she attends the Cannes Lions 2015 in Cannes, southern France. The reality TV star is scheduled to speak and sign copies of her new coffee table book “Selfish” during a Tuesday, June 30 night event hosted by the Commonwealth Club of California, which bills itself as the nation's oldest and largest public affairs forum.(AP Photo/Lionel Cironneau, File)
Kylie Jenner, sister of Kim Kardashian poses during a photocall at the Cannes Lions 2015, International Advertising Festival in Cannes, southern France, Wednesday, June 24, 2015. The Cannes Lions International Advertising Festival is a world's meeting place for professionals in the communications industry.(AP Photo/Lionel Cironneau)
Khloe Kardashian attends the NBCUniversal Cable Entertainment 2015 Upfront at The Javits Center on Thursday, May 14, 2015, in New York. (Photo by Evan Agostini/Invision/AP)
LOS ANGELES, CA - APRIL 23: TV personalities Kris Jenner (L) and Kourtney Kardashian attend Opening Ceremony and Calvin Klein Jeans' celebration launch of the #mycalvins Denim Series with special guest Kendall Jenner at Chateau Marmont on April 23, 2015 in Los Angeles, California. (Photo by John Sciulli/Getty Images for Calvin Klein)
NEW YORK, NY - JUNE 17: Kendall Jenner attends the 2015 Fragrance Foundation Awards at Alice Tully Hall at Lincoln Center on June 17, 2015 in New York City. (Photo by Michael Loccisano/Getty Images for Fragrance Foundation)
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