וְהָיָ֞ה אִם־לֹ֧א חָפַ֣צְתָּ בָּ֗הּ וְשִׁלַּחְתָּהּ֙ לְנַפְשָׁ֔הּ וּמָכֹ֥ר לֹא־תִמְכְּרֶ֖נָּה בַּכָּ֑סֶף לֹא־תִתְעַמֵּ֣ר בָּ֔הּ תַּ֖חַת אֲשֶׁ֥ר עִנִּיתָֽהּ׃ (ס)
S’il arrive que tu n’aies plus de goût pour elle, tu la laisseras partir libre de sa personne, mais tu ne pourras pas la vendre à prix d’argent: tu ne la traiteras plus comme esclave, après lui avoir fait violence.
Ramban
AND HE LAY WITH HER, AND HE AFFLICTED HER. He lay with her in natural gratification; and he afflicted her unnaturally. This is Rashi’s language. But Rabbi Abraham ibn Ezra said: And he afflicted her naturally because she was a maiden.” But there is no need for this for all forced sexual connection is called “affliction.” Likewise, Thou shalt not deal with her as a slave, because thou hast afflicted her.126Deuteronomy 21:14. And so also: And my concubine they afflicted, and she is dead.127Judges 20:5. Scripture thus tells — in Dinah’s praise — that she was forced, and she did not consent to the prince of the country.
Ibn Ezra
This instance of the verb enslaves means the same as its fellow [21: 14].
HaKtav VeHaKabalah
A living soul. This alludes to the unique human capacity for free choice. The word nefesh — “soul” — indicates desire, as in Devarim 21:14. The implication is that only human beings were created to exercise their free will.