How much do you need in common to make a relationship last?

To make a relationship last you need things in common, but what if you and a girl both love each other, and it went on long enough to be more than mere infatuation, and then you begin to realize that you do not really have that much in common?

This question is to people with experience in this matter, either positive or negative. I think I should take the risk and date the girl, as it is better than running away from love, but I don't want to ignore any warning signs. Any suggestions?
How much do you need in common to make a relationship last?
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