Sometimes, it's the humiliation that comes from the public finding out and putting a spotlight on it that is the kicker; not the random side piece(s) (ex: Bill & Melinda Gates).

I agree, though.

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edit: Funny enough, there's a House of Cards scene that goes over this exact scenario. Francis is sleeping with Zoe the reporter (they're both using each other for the perks/their own agendas). When Claire finds out, her response is something like "you know you must not embarrass me (publicly) with this", which Francis already knew because he would never do that to Claire... she doesn't say those exact words, but that was the vibe.

If he loved his wife he wouldn't have cheated on her, and then humiliated her and his children in front of the entire world.