I had a rebbe eons ago that said that the Torah contains one more mitzvah that precedes Beraishis. It reads, “Be a mentch.”
The technicalities that one is obligated or not to give a gett remain true. However, trapping someone in a loveless marriage, where their lives are miserable is nothing to brag about, or to claim that one is abiding by halacha. Abusiveness, even without causing bruises or drawing blood, is still disgusting, and violates the “mitzvah” of being a mentch. There are plenty of guidelines in how to behave in relationships that are not spelled out in halacha. And the Torah gives plenty of consideration to values, ethics, and morals. Precisely what halacha is implied in דרכיה דרכי נועם? Our volumes of mussar, authored by the greats of previous generations are not halacha texts per se. But they are filled with the guidance on how to conduct one’s life to be compatible with Torah value. Just because a man can bask in the glow that he is not obligated to give his wife a gett does not make him a tzaddik, or even a nice guy. Quite the contrary.