How a man can love another woman after 20 y. marriage?

How is it posible tbat a man falls in love with another woman while being married for the past 20 years and 1 kid

And later saying , now ex wife, was the most important person in his life

How its posible that this man while living with that woman falls for another one who regects him for like 6 months and he never stops trying

Ho can you fall in love while being married

How a man can love another woman after 20 y. marriage?
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