Khloé Kardashian shares sweet message to her 'one and only' Rob Kardashian: 'I'll forever be obsessed with you'

Khloe Kardashian Pens Sweet Message to 'My One and Only' Rob Kardashian

Although Khloé Kardashian recently admitted she's lost her patience for Rob Kardashian -- especially this year -- it's safe to say the bond between the close siblings is unbreakable.

Khloé took to Instagram on Monday to share a heartfelt message to her younger brother, posting a throwback photo of Rob kissing her on the head.

"If only you could see yourself through my eyes!" Khloé wrote. "I'll forever be obsessed with you! My one and only! #MyAce"

If only you could see yourself through my eyes! I'll forever be obsessed with you! My one and only! #MyAce

A photo posted by Khloé (@khloekardashian) on

WATCH: Khloe Kardashian Says Rob Kardashian Is 'Wasting His Life'

The message did spark a response from Rob, who retweeted his sister. "AWWWW this made me tear," he wrote.

See more about Khloé's recent weight loss:

Khloe Kardashian weight loss
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Khloé Kardashian shares sweet message to her 'one and only' Rob Kardashian: 'I'll forever be obsessed with you'
LOS ANGELES, CA - NOVEMBER 23: Khloe Kardashian attends the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LAS VEGAS, NV - JULY 04: Television personality Khloe Kardashian arrives at the Tao Nightclub at The Venetian Las Vegas to celebrate her birthday on July 4, 2014 in Las Vegas, Nevada. Kardashian turned 30 on June 27. (Photo by Ethan Miller/Getty Images)
LOS ANGELES - OCTOBER 9: Khloe Kardashian arrives at the Premiere of the new reality show 'Keeping up with the Kardashians' held at the Pacific Design Center on Octorber 9,2007 in Los Angeles, California. (Photo by Alberto E. Rodriguez/ Getty Images)
BEVERLY HILLS, CA - APRIL 10: Khloe Kardashian poses at the Jonathan Cheban launch of Kritik Clothing held at the Lisa Kline store on April 10, 2008 in Beverly Hills California. (Photo by Mark Davis/Getty Images)
LOS ANGELES, CA - JUNE 14: Actress Khloe Kardashian attends designer Kira Plastinina's United States Launch Party on June 14, 2008 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
LOS ANGELES, CA - MARCH 02: TV personality Khloe Kardashian attends the 22nd Annual Elton John AIDS Foundation's Oscar Viewing Party on March 2, 2014 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

Rob, 28, has struggled with depression and weight issues for the past two years. In an April episode of "Keeping Up With the Kardashians," his mother, Kris Jenner, said he gained 100 pounds in the last year.

"I've been working on my patience," Khloé, 31, told People in October about Rob. "I've been really trying. But I have my moments and I do snap. I've offered to get a chef, I'm like, 'What's your excuse?' But it's not just that. I can't win life for Rob. I have to wait until [he's] ready to do it for himself."

"Rob is such a great guy," she added. "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!'"

Rob currently lives with Khloé in her Calabasas, California, home and has been keeping a low profile from the public for more than a year. Earlier this month, Kris revealed that her only son didn't spend Thanksgiving with his famous family.

"He lives with Khloé [who hosted the holiday dinner this year], so he was around, and then went over to a buddy's house," Kris told Maria Menounos on her Sirius XM radio show, Conversations With Maria. "He's doing alright, he's doing his best. "He's working on himself."

"He's gonna be OK," she continued. "He's not as into being on camera as the rest of us."

WATCH: Rob Kardashian Posts Rare Instagram for Kylie Jenner's Lip Kit, but Not Kim Kardashian's New Baby

Apparently, he's not that into social media either. Rob has been largely absent from both Twitter and Instagram this year, though he did take some time out last week to promote his younger sister Kylie Jenner's sold-out lip kit. Curiously, he made no mention of a much more significant event that happened in the Kardashian family, although the news broke the same day -- Kim Kardashian giving birth to her second child with husband Kanye West.

Rob Kardashian Celebrates Kylie Jenner in Rare Instagram Post, But Not Sister Kim Kardashian

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