If a woman has been with the same man for 20 years, and he starts a mid life crisis, how can she save what they've built?

She was 17, he just turned 21, and they loved each other in every meaning it encompassed, 20 years later, she's 38 he's 42.. he gets some tattoos, a new truck, taste in music changes dramatically, and his style of clothes is also way beyond what she's known him to wear in the better part of their time shared with each other. all of this changing he's done, she can't help but wonder, if maybe there is a female other than her that he may be changing her out for next. She gets on their wireless phone account and discovers page after page after page of texts to one particular number, after a little investigation, she finds out that her husband is texting a 23 year old girl... She is crushed..
When she tells him she knows about the number and the reasons he had been spending hours everyday after work locked in his shop, he scolds her, yelling and appearing to show no regrets in regards to what he's done, nor does he seem to have any respect for the sanctity in all that she thought they had.. what should the woman do? He is all she knows and she has felt the exact same intense love for him at year 20 that she felt when the first day that year one began. how can she make him see that he is about to cause irreversible damage to them and their two kids?
She knows he still loves her.
Vote A
This new girl will just run out when he gets too old to provide for her. Or worse she'll probably cheat. Thats what i think anyway.
Vote B
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If a woman has been with the same man for 20 years, and he starts a mid life crisis, how can she save what they've built?
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