The Boundaries Between Engaged Couples Before Marriage

Question
A young man is engaged to a girl and their marriage has been contracted, but they have not publicly announced the marriage. There was some physical play between them, but without intercourse. After a while, a disagreement occurred that led to their separation, and the young man regrets his actions because he did not expect the separation, knowing that she was the one who initiated the physical play. The young man swears that he never had intercourse with her, only external play. Are they sinful for this, and what is the expiation?
Answer
I say, and with God's help: After writing the contract, she becomes his wife. If a valid seclusion occurs or anything that necessitates intimacy, as they mentioned, he must pay her the full dowry, and God knows best.
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