How can a wife act normal after knowing about her husband’s 10-year affair for 7 years?

And the wife knows for 7 years. Never confronted acts completely normal to the husband. Why and how can she do this despite she's pissed and feels threatened.

I couldnt survive this as a wife id rather be living in a homeless shelter.

How can a wife act normal after knowing about her husband’s 10-year affair for 7 years?
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