Rob Kardashian used to be a reality star. His sister just explained why he disappeared.

Khloé Kardashian has become the most guarded of the Kardashian sisters.

Since stepping into the spotlight at the age of 23 on Keeping Up with Kardashians, Khloé has had to endure constant criticism and intense speculation about her body, plastic surgery and dating life.

Over the years, Khloé has navigated two infidelity scandals in the public eye, both with her ex-husband Lamar Odom and the father of her two kids, Tristan Thompson.

Once outspoken and the 'realest' of the Kardashian-Jenner siblings, Khloé has become comparatively subdued and aloof over the years. She rarely does interviews, and aside from her family's reality show The Kardashians, we don't hear much from her outside of Instagram selfies and spon-con.

Watch Kim and Khloé Kardashian get into a heated fight. Post continues after video.

But finally, she's ready to talk… and she's got a lot to say.

Khloé has launched a podcast on X called Khloé in Wonder Land, and she's just appeared on the Call Her Daddy podcast.

We've rounded up some of the biggest revelations from the interviews.

Khloé Kardashian addressed why we rarely see Rob Kardashian anymore.

Rob Kardashian was a popular reality TV personality, making his mark on Keeping Up with the Kardashians before getting his own spin-off show (albeit, for one season) with his ex-partner Blac Chyna called Rob & Chyna.

Rob's appearances on KUWTK became a rarity from season 10 onwards. While he never made a formal exit, Rob chose to step back from regular filming and reports cited mental health struggles as the reason for his absence.

Khloe Kardashian, Rob Kardashian and Kim Kardashian in 2011. Image: Getty.

Since then, Rob has maintained a very low public profile. He is rarely seen in public, instead focusing on raising his daughter, Dream. He has made sporadic cameos via text messages or video calls on The Kardashians, but has not returned as a main cast member.

Now, Khloé has addressed Rob's change in attitude from being a front-facing member of the family to the sibling rarely seen.

"I call him 'The Wizard' from The Wizard of Oz," she said on Khloé in Wonder Land. "He likes to be behind the curtain."

That said, Khloé said he's still very present in her day-to-day life, as he lives next door to her and their mum, Kris Jenner.

"We all live in the same gated area," she said. "He lives right next door to me."

Other revelations in Khloé Kardashian's interview with Alex Cooper on Call Her Daddy.

Khloé Kardashian reflected on being cheated on by Lamar Odom and Tristan Thompson.

She revealed it was her sister Kim Kardashian and their mother Kris Jenner who broke the news to her about the infidelities of both Lamar Odom and Tristan Thompson.

"Kim has been aware of the cheating — [in] both instances, I think Kim learnt about it first. It's quite unbelievable. My mum, regarding my ex-husband, was aware of details before I was, and had to break the news to me," Khloe said.

She recounted the moment Kim found out about Tristan's betrayal… while they were filming. "When Kim found out about Tristan cheating on me, it was right before she was about to go into an interview, and it unfolded while she was in the chair. I'm not sure how much would have been aired if it hadn't happened in real time."

View this post on Instagram

A post shared by CALL HER DADDY (@callherdaddy)

Khloé went on to say that she caught Lamar Odom cheating on her. "I looked through the window and saw him with a girl, either naked or in lingerie. I knocked on the door, and for some reason, they opened it. I just lost it." She then described going to her niece Penelope's birthday party the next day, hiding her bloodied knuckles with bandannas to match the cowboy theme, pretending nothing had happened.

Khloé also opened up about the shame and regret she felt after Tristan's repeated betrayals, especially towards her younger sisters. "The most painful aspect was how much I let my younger sisters down. They warned me, saying 'He's going to do this again. Don't stay with him.' I could sense their disappointment."

Reflecting on her past relationships, Khloe admitted, "Perhaps the second instance hurt more because I endured it longer," she said.

"I felt more shame, knowing it was likely to happen again."

Feature image: Getty/Call Her Daddy.