Gayle King recalls finding out her ex-husband was cheating on her best friend

Gayle King relives one of the most brutal betrayals of her life: catching her ex-husband William Bumpus cheating… with her own best friend.

Appearing on the “Call Her Daddy” podcast on Wednesday, Gayle said she came home from the airport early one day and immediately knew something was wrong when the house alarm went off – which William appears to have done. Never did.

Gayle says William ran out of the room, wrapped in a towel, and tried to stop her from entering, warning her that someone was inside.

She said she searched the house and found a woman hiding behind the door… also wrapped in a towel. Then came the punch in the gut: this woman was his best friend!

The “CBS Mornings” host says she asked how she could do that to him…but the real thing? Gayle says William then drove the woman to the train station so she could be reunited with her own husband.

Gayle called later Oprah to vent…and Oprah apparently told her that the incident suggested the betrayal ran much deeper than she thought.

The couple divorced in 1993 after 11 years of marriage.