You should not return to your wife? Deuteronomy is dealing with unbaptized people, with non-Christians, where divorce is possible by Divine dispensation. But with Christians, there is no such thing as divorce and so yes, you are supposed to return to your wife if you have an affair.
When a woman marries another man, she is no longer 'your' wife.
Deu 24:3 And if the latter husband hate her, and write her a bill of divorcement, and giveth it in her hand, and sendeth her out of his house; or if the latter husband die, which took her to be his wife;
Deu 24:4 Her former husband, which sent her away, may not take her again to be his wife, after that she is defiled; for that is abomination before the LORD: and thou shalt not cause the land to sin, which the LORD thy God giveth thee for an inheritance.
The woman at the well was not a baptized Christian but a Samaritan. She only even knew Jesus was the Messiah when He explained it to her at the well.
The woman at the well had been married 5 times, and Jesus recognized that. he did not say she continually lived in adultery, Jesus said you were married 5 times, and the person you are with now is 'not' your husband.
Your doctrine does not match scripture still.
Again, I agree 2 Christians should not get divorced, but the reason for that is 2 Christians would not commit fornication against each other.
That is the point.
There is no condoning of adultery.
What 'you' are saying is if your spouse decides to leave you for someone else, refuses to repent and restore the marriage, that the person who had remained faithful must remain so until their death, because they are not set free and there is no peace for them. That's wrong.
1Co 7:15 But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.
You keep saying, well if they are both 'Christians'... we have already established a Christian would not be having an affair and be committing adultery.
Mat 12:33 Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit.
Jas 2:26 For as the body without the spirit is dead, so faith without works is dead also.
So to clarify again, no Christians should get divorced, because Christians would not produce the fruit of fornication.... and even if they did, they would soon repent, conscious cut by what they had done. That leaves no room for divorce.
So OBVIOUSLY I am talking about 1 of the 2 could care less about God, decides they want the world, and they refuse to repent. God is saying through Paul to let them have the world, and you are no longer under bondage to them who want the world.
Free to start new.