Acknowledge your mistake first. Then, try to forgive yourself. Everyone makes mistakes, and this is your chance to learn from it. Focus on doing good deeds in the future.
First, you should realize that what you did was wrong morally. You need to cut off this relationship immediately. Avoid any further contact with this man to prevent more harm to his family and yourself. It's important to respect the institution of marriage.
He might wake up in a completely different world. Maybe technology has advanced beyond his imagination, or society has changed in ways he never expected.
This question involves many different cultures and moral values, so there is no universal answer. In some novels, it might be described that a man thinks that the woman he has slept with is his, while in other novels, it might be described that a man values a woman's heart and feelings more. In addition, there are many other factors such as the man's personality, the woman's feelings for him, the relationship between them, and so on, which may affect the view of love. Therefore, there was no definite answer to this question. It needed to be analyzed according to the specific storyline and cultural background.