Christie Brinkley admitted her whirlwind life with Billy Joel , filled with an alcohol addiction and a possible affair, was too much to handle, and she "had to walk away," RadarOnline.com can reveal.

The 71-year-old appeared on the Totally Booked with Zibby podcast to open up about her ex-husband, who is now dealing with a brain disorder. Article continues below advertisement

Brinkley's Painful Dilemma

In Brinkley's new memoir , Uptown Girl , the former model detailed plenty on her life with Joel, including the dark times; something that she found difficult to do.

"The part that stressed me the most, because I'd never, ever want to hurt him, is (writing) about Billy," Brinkley said during her podcast chat. "I don't like to ever say anything bad about anybody, but I need

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