The 36-year-old reality star started sobbing on the E! series after learning about the 39-year-old rapper's concert meltdown, which took place in November.
"What's going on?" Kardashian asked West's friend on the phone before breaking down in tears. "Like, I can't."
West was performing Nov. 19 in Sacramento, Calif., when he started ranting about Beyonce and Jay Z and abruptly ended his show.
He canceled the remainder of his Saint Pablo tour Nov. 21, and was hospitalized for "exhaustion" the same day.
People reported Dec. 2 that West was undergoing outpatient care for undisclosed mental health issues after being released from the hospital. His breakdown followed Kardashian's robbery in Paris in October.
"Kim wants him to continue getting therapy even after all of this. He has support from so many people," a source told E! News in December. "She wants to get Kanye back on his feet. She is not leaving him. She loves him."
Sunday's episode also showed Kardashian's struggles with anxiety after her robbery.
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