What is the ruling on continuing to communicate with a girl I loved for five years who married someone else, despite her promising to divorce him and return to me? Should I wait for her, or try to forget her?

The relationship with any married woman with whom a man has an affair must be immediately severed, as this is forbidden and constitutes incitement of a woman against her husband, which is one of the gravest sins. It is advised for those who are not married to marry, for it is a fortress against the unlawful and a source of tranquility for the soul.