How long is a piece of string?
You could spend a lifetime with someone and never truly know them.
I 'dated' my husband on and off for 6 years before we got married and you would have thought i knew everything about him by then.
I'm still discovering new things about him as i write and i'm sure he is learning new things about me too.
As bellawritter23 wrote, 'Times change and people change too.'
When chosing your lifepartner, facts about them are important but so also are what your heart and intuition say about them too.