A man discovered his wife has a mental illness shortly after their court marriage, an issue not disclosed beforehand. This situation is considered fraud and cheating. While divorce typically requires one year of marriage, if mental illness is the grounds, a petition can potentially be filed after six months. The Hindu Marriage Act, 1955, Section 13(i)(iii) outlines mental disorder as a ground for divorce, defining it as an incurable unsound mind or a mental disorder preventing reasonable cohabitation.