How can married man be in love with another woman in a 5 year relationship and never have any guilt?

Anonymous
How can he lie so easily to his wife and kids about his whereabouts? He lies and is out with the other woman until 9 at night on a weeknight. Sometimes later. Meets her on occasional weekends leaving family behind.
Yet say it isn't in his disposition to leave them. He won't abandon his wife with the kids. 14 and 13
That she hadn't worked in 17 years how scary it would be with no health insurance, recent work experience, etc..
Yet announce to his lover of 5 years and his friends he loves someone else.
Is this an Indian culture thing? He's been in the usa 30 years.
The wife secretly knows but stays quiet. He is unaware of that fact.
He tells the other woman he will never ever leave her. He loves her and it's up to her what she wants to do with the relationship.
WTF?
How can married man be in love with another woman in a 5 year relationship and never have any guilt?
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