Michael le Vell, who has played Coronation Street's Kevin Webster for 26 years, is reported as saying he'll leave the soap if his on-screen character doesn't change his ways after learning that Sally has cancer.Michael apparently told The Sun: "If Sally's cancer doesn't end the affair and Kevin's got no remorse towards her then I'm leaving because I can't be putting up with it. If he carries on with Molly he doesn't deserve to be in the family unit, it's as simple as that. I hope Kevin gives all of his backing to Sally because if he doesn't he's a bigger b*****d than I thought he was."