Khloe Kardashian revealed she blames herself for her younger brother, Rob Kardashian's health and weight issues in Sunday night's episode of Keeping Up With The Kardashians.

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While the Kardashian and Jenner family enjoyed a family vacation in Thailand in the pre-taped episode, Rob was noticeably missing from the group, HollywoodLife reported Sunday. Viewers saw that Khloe wasn't able to enjoy the trip as much because she was worried about Rob.

But she also shed light on why she felt guilty for Rob's very public struggle -- it's all connected to the time Rob lived with Khloe and her now estranged husband, Lamar Odom when they were experiencing their own marital woes.

Insider Reveals If Khloe Karadashian Blames Lamar Odom For Rob Kardashian's Drug Issues

Khloe told her step-brother Brody Jenner, "Rob has said, 'Being in that house, it was so dark, and it made me do dark things.' It gets to me, it makes me feel bad. I definitely feel guilty, and I don't care what anyone says, I was not there to protect Rob, I was not even there to protect myself."

Jenner tried to comfort Khloe and told her, "Please don't ever feel that guilt."

It looks like Rob took to his Twitter to respond to Khloe's concern for him. He posted a series of snapshots from the episode that featured them together. He added the caption "Love u."

Khloe retweeted the pictures and added, "My brother!!!"

Their bond isn't too shocking considering Khloe has been one of Rob's greatest supporters during his struggle to get healthy and shed the more than 40 pounds he's gained within the last two years.

Tags: Rob Kardsahian Rob Kardashian Weight Gain Rob Kardashian Weight Loss