if we lived for 500 years or so do you think we would embrace marriage?

I think there will always be those that embrace it and still feel its importance to them and those that don’t feel it’s needed in society today.

No. I think we might embrace something but with a contractual end date…with option to renew lol

Rather depends on whether you're male or female and which country you're in.

Much of the world was ruled by the Catholic Church at that time with all sorts of expectations for the populace, regardless of social status or piety level.

Meaning you could be married young and beheaded/burned at the stake etc. and very little in the way of burden of proof required.
Especially for women.

Clearly your marriage is not a happy one.

The idea of a marriage is that two people who like doing stuff together and who enjoy being together decide they want to make it official.

Usually that agreement works well until it doesn’t.

What does time have to do with it? No.