This will be a case of adultery. Adultery means voluntary sexual intercourse between a married person and a person who is not their spouse. As she is romantically and sexually involved with her boss that means she is cheating on you and this is a case of adultery. Before September 2018, adultery was an offense according to the Indian Penal Code. But on 27 September 2018, the Supreme Court’s five-judge Constitution bench unanimously ruled to revoke Section 497 and that is no longer a crime in India. Chief Justice Dipak Misra said when reading the decision, “it (adultery) cannot be a criminal offense,” but it can be a reason for civil problems such as divorce. Thus, you can’t file a case of adultery against her but you can definitely opt for divorce.