Divorce in the Bible kinda wild.

• Moses permits a man to divorce his wife except when a man provably falsely accuses his wife of not being a virgin (literally if her father presents to the town a bloodied sheet from the wedding night) or if a man rapes an unbetrothed virgin (he must marry the girl he raped though)
• Jesus says, "Yeah, Moses said you can divorce people, but that wasn't God's plan. God just changed his mind cause y'all were removed too much. Unless one of you cheats then it's chill to divorce." The disciples in response quip about how it's better to stay single then and Jesus responds, "yeah it's better not to fuck around."
• Paul, acknowledging neither precedent, then comes along and says if your unbelieving partner wants to leave let them.

In conclusion God allows divorce unless your husband is shit, but actually he hates it and it was never part of his perfect plan unless you cheat, but he changed his mind cause people were hard to deal with, but really it's totally permissible if your unbelieving partner wants it.

This clearly demonstrates the acclaimed love and deep understanding of a God who is forever unchanging, "the same yesterday, today, and forever," and who is the single source of objective morality.