King James version has lines like "your soul shall surely perish" which doesn't sound like eternal damnation to me. It does say Lucifer was cast into the lake of fire, but to my knowledge doesn't suggest this is a place human souls would end up.

Honestly I believe that hell was mostly an invention of religious leaders to gain more worshippers, and therefore more power. I don't believe in any of it though.

My understanding is that it's a temporary period of "purification" or redemption, not eternal, but that has been lost in translation. I'm not a theologian though.

Yes, it says it's forever. The Catholic church does have a doctrine of purgatory, but it's for the flawed faithful.

But it also treats it akin to a spouse that has been continuously cheated on; all his gifts twisted, broken, and trashed; finally leaving the house.

Or self-inflicted by humanity, God going: "do you really, really want to stay apart from the source of life and all good? Then have it your way... ☹️"

The Greek Bible uses the word αιών, which (confusingly) refers to either a duration of time with a beginning and end, or eternity. When the Bible was translated into Latin, αιών was translated as aeternam exclusively. However, that sense may not have been the right one to use. The earliest writings of the church, before the 5th century or so, described Hell as an ultimately temporary place of purification, rather than an eternal destination.