Why do women stay with men who won't marry them?

Why do women hold on to men for years who are not marrying them? Or the men have put a ring on her and promised marriage but it never happens, and the dudes will keep making excuses for why it's taking so long. You either want the girl as a final wife or you don't, simple as that. Why do women keep staying with them?

Why do women stay with men who wont marry them?
Why do women stay with men who won't marry them?
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