"He asked her to never say anything about it so she didn't," says source

By Jennifer Garcia
Updated April 30, 2015 08:50 PM
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Credit: Jamie McCarthy/Getty; Splash News Online

After revealing he is transitioning from male to female, Bruce Jenner now focuses on creating a new existence as a woman. Subscribe now for instant access to the exclusive new details you didn t see on TV and how Kris truly feels, only in PEOPLE.

There were more than a few bombshells in Bruce Jenner‘s emotional 20/20 interview with Diane Sawyer.

Jenner, 65, admitted he began dressing in women’s clothing at the age of 8 or 9 when he would sneak out in his sister’s dress, but revealed that stepdaughter Kim Kardashian West caught him in women’s clothing years ago before told her and the rest of his family that he is transitioning from male to female.

“He asked her to never say anything about it so she didn’t,” explains a source close to the family. In fact, the one-time incident was only spoken about once. “He just called Kim after it happened and told her to never say anything, so she respected that,” continues the source. “They never spoke in depth about it.”

In Jenner’s interview with Sawyer on Friday, he revealed that Kardashian West, 34, has been the most accepting of his gender transition.

“They’re the closest out of the Kardashians because she has been the most understanding and perhaps because she had this experience early on,” says the source. “She’s always there to listen and try to understand what he’s going through.”

After watching the 20/20 interview together as a family, Kardashian West visited her stepfather’s Malibu home the following day to bring him lunch and “see how he’s doing,” a source explained to PEOPLE at the time.

Editor’s note: Per Bruce Jenner’s request, PEOPLE will continue to use male pronouns until otherwise instructed.

For much more of Bruce Jenner’s new life, including what his ex-wives really knew, pick up the latest issue of PEOPLE, on newsstands now

Exclusive Details on Bruce Jenner’s New Life