"Cinderella Complex" or "Disney Complex" is a term that masks what's really happening - they're "Monkey Branching". They're swinging from branch to branch, always for a better mate. They keep trading up until inevitably they swing and miss or simply can't go any further. Then the try to go back and get together with someone they previously dumped. Men aren't playing that game anymore.
That's the mindset of a professional. Men do something similar with their jobs, always looking for a higher position up the tree. Once a better offer comes in, it's hasta la vista baby, and ne'er another thought.