The 68-year-old former I Am Cait star has been estranged from her stepdaughter for longer than one would probably assume.
"It's been a little bit tough over the last couple of years on the Kardashian side," Caitlyn said while speaking to students at the U.K.'s Cambridge Union on Monday night, according toPeople. "To be honest, I don't talk to them anymore. Kim, I haven't talked to in a year."
Caitlyn disclosed the sad news while talking about her memoir, Secrets of My Life, which was mainly responsible for her falling out with the Keeping Up with the Kardashians stars.
Kim cut ties with Caitlyn after reading Secrets of My Life because she thought it painted her mother, Kris Jenner, in a very unflattering light.
"They don't want me in their lives, they bashed me pretty badly. It's devastating when your kids do that. It really hurt," Caitlyn continued. "I don't know what the future holds. We will see."
Kim felt that Caitlyn accused Kris of hoarding all their money when they were married and being aware of Bruce's tendencies to want to dress like a female for years before he officially transitioned into a woman in 2015.
Caitlyn also alleged in her memoir that Kris had made her suppress her true self.
Kim whole-heartedly supported Caitlyn's transgender transition at the time, but she took her mother's side when Kris and Caitlyn's relationship fell apart.
In April, an insider told Us that Caitlyn's book was "the last straw" for Khloe Kardashian because she no longer identified with "this person who seems to have stopped caring for the family."
In fact, Caitlyn and Kris -- who wed in 1991 and filed for divorce in September 2014 -- actually both reportedly attended Kendall's 22nd birthday party at Petit Taqueria restaurant in Los Angeles, where Kim and Khloe were present as well.
"Kris and Caitlyn only had a brief interaction to say hello, but everyone seemed fine," a source told People of the gathering. "They were all focused on making it a special birthday for Kendall."