10/27/2008 05:12 am ET Updated May 25, 2011

Warren Buffett Opens Up About Love Affair With Katharine Graham

The world's richest man is finally opening up about his complicated love life.

Warren Buffett, whose shrewd investing has swelled his Berkshire Hathaway assets to nearly $278 billion, reveals in a new biography that "the biggest mistake I ever made" was letting his late wife, Susie, walk out the door of their Omaha home.

Buffett, 78, who spent thousands of hours talking with author Alice Schroeder for her engrossing book "The Snowball," admits he gave Susie plenty of reasons to leave.

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