Jer 3:14 Turn, O backsliding children, saith the LORD; for I am married unto you:
1Ch 5:25 And they transgressed against the God of their fathers, and went a whoring after the gods
Jer 3:8 And I saw, when for all the causes whereby backsliding Israel committed adultery I had put her away, and given her a bill of divorce; yet her treacherous sister Judah feared not, but went and played the harlot also.
Fornication/Adultery can be either "physical or Spiritual".
Mt 19:3 The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause?
Mt 19:8 He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
:9 And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
Man can divorce only for the same reasons God had to divorce Israel, and it's the reason God gave man the right to divorce, but divorce from the beginning wasn't predestined, or not so.
And much like a man dating another woman in front of his ex to make her jealous, so does God.
De 32:21 They have moved me to jealousy with that which is not God; they have provoked me to anger with their vanities: and I will move them to jealousy with those which are not a people;
Ro 11:11 I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy.
The law, in binding the wife also bounded the husband, to the other until death, God can't die, so the "wife" (Israel) must die, then they can be married to "ANOTHER".
Ro 7:4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
And as part of their "chastisement" for rejecting Jesus, they will "literally" become "dead" to be married to Jesus.
Re 12:11 And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
Re 6:9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: