Is a man's marriage to a woman with whom he had an illicit relationship a condition for the acceptance of his repentance, especially if that would lead to the divorce of his first wife?

It is not a condition for the acceptance of a fornicator's repentance that he marry the woman with whom he fornicated. Rather, it is impermissible for him to marry her until after both of them have repented, and he must conceal himself with God's concealment. Sincere repentance expiates fornication. He should sever his relationship with the untrustworthy girl and turn to God with good deeds and regret what has passed, for whoever repents, God accepts his repentance.