<< when a man leaves his wife for a younger girl and cleans up his act, kinda makes you wonder if something was wrong with the woman, no? >>
No, it doesn't mean that. It means that either the couple should never have been together (been there -- great woman, we just weren't compatible), or it means that he figured out that if you're a dick in a relationship, you receive nothing from it. On the other hand, if you try and work things out, it's better for both. Or, it means that he's a shallow, self-centered prick who wants a trophy wife and grooms himself so that others admire his vain self.
Could mean a lot of things, but I sincerely doubt it means what you say. If you were trying to be puckish, you wound squarely into the prickish category. You're a couple letters off.