What does “for better or worse” mean?

used to say that sth cannot be changed, whether the result is good or bad

How is “for better or worse” used?

In The Stranger (1946), one line is: “Darling, I meant it when I said for better or for worse.”

The clip at the top of this page is from The Stranger (1946).

Darling, I meant it when I said for better or for worse.

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