Why do you think men will date one girl for years (like 8-9 years) but marry a girl he just met 2-3 months ago?

This thing happened with many women ik. Why did this happen? Is it the right time or the right women thing?
Why do you think men will date one girl for years (like 8-9 years) but marry a girl he just met 2-3 months ago?
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