'Dealt' in the Bible

Judah hath dealt unfaithfully, and an abomination is committed in Israel and in Jerusalem; for Judah hath profaned the sanctuary of Jehovah which he loved, and hath married the daughter of a strange god.

Yet ye say, Wherefore? Because Jehovah hath been a witness between thee and the wife of thy youth, against whom thou hast dealt unfaithfully: yet is she thy companion, and the wife of thy covenant.