Money really exposes ones character... It like getting intoxicated and start saying things you wouldn't have normally said. If you become bad due to money.. it has always been on your mind to do those things and if you're good. You have been naturally good at heart..

The example you used of the person you know.. he must have been that good and kind because he was benefitting from the wife and of course conscience will naturally make him reciprocate but once he feels he has made it and feels he no longer needs the wife's consent; after all he's now the provider and can afford whatever he needs.. voom his true colour appears and this applies to literally everyone... If you do not have integrity, with money you can easily be convinced or confused