Does the person I was associated with—and against whom I committed some mistakes after learning of his betrayal, leading him to curse me, insult me, and threaten me—have a right and a grievance against me, and how can I forget him?

Emotional relationships between a man and a woman before marriage are forbidden by Islamic law because they are a means to corruption, as affirmed by the noble verse: "chaste women, not those who commit unlawful sexual intercourse or take secret lovers." Engagement does not mean that the fiancée has become a wife; rather, she remains a stranger to the suitor until the legal marriage contract is concluded.

If this man supplicates against you unjustly, his supplication will not be answered because it is a supplication involving sin.

As for treating attachment to a man and seeking a righteous man for marriage, this is possible by seeking help from trusted female friends.

A working woman must adhere to Islamic guidelines, such as wearing the hijab (definition) and avoiding unlawful mixing with men.

And Allah knows best.