When the amount of leeway you're willing to give someone based purely on their attractiveness runs out. Like a check that bounces because of insufficient funds, a 'cute check' is given by uninteresting but attractive people but soon bounces when you find there's nothing in the 'account' to draw interest from.
Cameron: "I don't know why you still put up with that Tony kid. His cute check bounced about 1 day after I met him and then I just couldn't stand to be around him."
Gyro: "Yeah I know, but he's just so darn cute."
Cameron: "Yeah well, whatever."