Bruce Jenner is allegedly preparing to file to divorce from Kris Jenner.
The 63-year-old Olympic gold medallist is said to have consulted a lawyer because he is fed up with Kris, 55, flirting with younger men and belittling him in public.
A source told the National Enquirer: "Bruce feels that Kris treats him like a doormat, and he's had enough.
"She constantly belittles his appearance and complains to mutual friends that he's a boring old fart. Then she has the gall to flaunt her relationships with younger guys in his face."
The couple have been married 21 years.