Guys, what would you do if you're married, been married for 10+ years, 3 kids, only to find out that the children, by DNA test aren't yours?

This is a situation that a lot of men face. It's close to 40% of all children who are DNA tested, the "father" is not the father.

What would you do?
Guys, what would you do if you're married, been married for 10+ years, 3 kids, only to find out that the children, by DNA test aren't yours?
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