subject: What to do with a Cheating Man [print this page] If you've been with a serial cheater and you don't want to lose him, be ready for more heartache in the future. No matter what he says, he will cheat again. If you think your heart can stand it, give him a second chance. Otherwise, get out of the relationship. "Once a cheating man, always a cheating man," the saying goes and with guys like that, you can count on it to be true.