Cheating on one’s spouse may be a betrayal of the heart, but in New York State, it’s long been a criminal offense.But after nearly 120 years, a law against adultery — a misdemeanor in New York — could be scratched off the books. State lawmakers are advancing a bill this session to toss the rarely enforced section of the state penal code that since 1907 has defined adultery as a Class B misdemeanor punishable by up to 90 days in jail and a $500 fine.Assemblyman Charles Lavine (D), who sponsored the bill, said the law is out of step with modern society. He noted earlier this month to…