What does Christ mean when he says, "Whosoever putteth away his wife, and marrieth another, committeth adultery"?

How is "putting away" related to "dealing treacherously"?

Do either of these end a marriage with "the wife of thy covenant"?

Does anything else end such a marriage?

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Malachi 2:14: "Yet ye say, Wherefore? Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant."

Luke 16:18: "Whosoever putteth away his wife, and marrieth another, committeth adultery: and whosoever marrieth her that is put away from her husband committeth adultery."