"If you're married 18 years to a grouchy person who gets under your skin and never compliments you, after a while you want to divorce him," a source with knowledge of the Brady-Belichick relationship told ESPN's Ian O'Connor, author of "Belichick: The Making of the Greatest Football Coach of All Time," after the 2017 season.

"Tom knows Bill is the best coach in the league, but he's had enough of him. If Tom could, I think he would divorce him."