Why would a wife tolerate an 8-year affair while sabotaging it?

She hates the mistress, threatens her and never confronts her own husband. Her college kids same thing. Does everything she can to break up the affair by manipulation. So basically allowing and enabling the affair. Like giving him an OK but at the same time doing things to disrupt it? 8 years.

Dont bother asking oh are you the mistrss. Oh jes a pos, and y'all should die kinda stuff

Why would a wife tolerate an 8-year affair while sabotaging it?
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