Deuteronomy 22:19 "He may not send her away as long as he lives"

A person who defames his wife by accusing her of indecent behavior must prove her guilty in Beit-Din.

If the accusation is proven to be false, the husband is obligated to make amends to his embarrassed wife (See Positive Mitzvah 219).

The Torah commands him to stay married to her and never divorce her. He should try hard to please her and make a happy home.