Cheater Steals Cheating Coach's Cheating Heart

Takes one to nail one: Patriots ballcoach Bill Belichick is hooking up with a woman who killed her last relationship by cheating ... with Bill.

As the Palm Beach Post reports, Linda Holliday racked up a whopping $25K on her ex-BF's bill in less than five months. She claimed it was to help stock her fashion boutique, but court papers say she spent a ton on trips and jewelry for herself, too.

The sap, Bill Mayfield, cut Linda off after he signed for a bouquet of flowers from Belichick to his lady, with a card that read, "Thanks for the wonderful evening."

Linda and her ex have settled the bill.