Ugh, I can practically hear the dramatic music cueing up just thinking about this trope. It's everywhere, but when it hits right, it's like literary junk food you can't stop consuming. The setup usually goes: the CEO husband is cold, neglectful, maybe even publicly humiliates the wife. She finally leaves, often after a hidden pregnancy or after she's quietly built her own empire. Then BAM, he realizes what he lost.
The best twists aren't just him showing up with flowers. It's when the revelation is tied to something he overlooked. Like, he discovers she's the anonymous artist he's been obsessed with acquiring for his collection, or that the brilliant consultant saving his failing company is her under a pseudonym. The 'begging' part gets real when his power and money are useless; he has to be emotionally naked and vulnerable, which is a total reversal of their old dynamic. The satisfaction comes from watching that untouchable authority figure completely unravel.
My favorite version is when the 'remarriage' isn't the immediate happy ending. She makes him work for it over a whole second book, proving he's changed, not just regretful.