Because I didn't want them to leak it to the press. She told the host that the members of this family could not be trusted. 'I had already been living as Caitlyn for a year and a half, OK? To be honest, I don't talk to them anymore.
Kim now wished that her stepmom, Cait, would just shut up and stop bashing her family everytime she gets the chance of doing so.
Additionally, the 68-year-old does not believe the family is "entitled to know before the world" as the surgery was "not that big a deal".
The reality TV star has been married three times - to Chrystie Scott, Linda Thompson and Kris Jenner - but since she transitioned from Bruce to Caitlyn in 2015, she hasn't had any serious relationships, despite being linked to stars like Sophia Hutchins.
The rift between Caitlyn Jenner and the Kardashians has grown bigger and bigger ever since her memoir, Secrets of My Life, came out last April.
She continued: "I didn't tell anybody, Why? it's none of their business." before adding they had no reason to be "p****ed off".
Kim Kardashian accused her stepfather of giving her an abridged version of the book to approve before it was published, leaving out details of her recent surgery and accusations about her father Robert Kardashian.
She explained, "I didn't want them to leak it to the press, okay?" I had 23 years of raising her.
When Morgan inquired about her physical changes and joked that there were "certain areas we know about" Jenner fired back. "You just said, "Oh, certain areas".
"It's not a joke, it's life and it's very serious. People die over this issue".
Caitlyn then began to reply: "Well, I was 6'2...", but she soon trailed off and the interview became incredibly tense.
"See, you made a comment there and that's why you could get in trouble", she snapped.
Rather than apologise outright, Piers simply replied: "Point taken".
The Olympic champion has always maintained that the secrecy was not meant to be hurtful to her ex-wife and former stepchildren, but now she's getting a little more candid about why she didn't tell them she was getting gender confirmation surgery.