I've never heard of divorce without cause as there has to be a reason why the two divorce.
1 Corinthians 7:10, 11 Jesus commands the woman not to leave her husband and if she does she should remain unmarried or be reconciled back to her husband, but in Malachi 2:10-16 the treachery that man commits against a woman which leads him to have an affair outside of the marriage or abuses the wife whether it be physical or emotional gives place to what was said by Moses in Deuteronomy 24:1-4 that if a woman is no longer pleasing to her husband then the husband should give his wife a written bill of divorcement and send her out of the house and this gives the woman the right to marry again, but she can never go back to her former husband if that marriage does not work out or her husband dies for now she is defiled to be with her first husband and this is an abomination to God.
When I said without cause, I should have clarified that I was referring to the only biblical reason that God allows for divorce.
Mat 5:31 "It was also said, 'Whoever divorces his wife, let him give her a certificate of divorce.'
Mat 5:32 But I say to you that everyone who divorces his wife, except on the ground of sexual immorality, makes her commit adultery, and whoever marries a divorced woman commits adultery.
Yes, Before they had the holy spirit leading them and guiding them, "Because of the hardness of their hearts" Moses allowed them to divorce, but Jesus who brought the new covenant straightened out their theology and dealt specifically with that issue.
Mark 10:2 And Pharisees came up and in order to test him asked, "Is it lawful for a man to divorce his wife?"
Mark 10:3 He answered them, "What did Moses command you?"
Mar 10:4 They said, "Moses allowed a man to write a certificate of divorce and to send her away."
Mar 10:5 And Jesus said to them, "Because of your hardness of heart he wrote you this commandment.
Mar 10:6 But from the beginning of creation, 'God made them male and female.'
Mar 10:7 'Therefore a man shall leave his father and mother and hold fast to his wife,
Mar 10:8 and the two shall become one flesh.' So they are no longer two but one flesh.
Mar 10:9 What therefore God has joined together, let not man separate."
Mar 10:10 And in the house the disciples asked him again about this matter.
Mar 10:11 And he said to them, "Whoever divorces his wife and marries another commits adultery against her,
Mar 10:12 and if she divorces her husband and marries another, she commits adultery."
Yes, Malachi 2:14 Even in the old testament, even though they were allowed to Divorce; God is condemning it even back then and referring to how Divorcing your wife or "putting her away" is treating the wife of their youth Treacherously by being faithless to her.