Honestly? I think the title itself kind of tells you the whole arc upfront. It's never really about the divorce itself, that's just the inciting incident, the catalyst that finally breaks the protagonist's shell. The story becomes a masterclass in reactive transformation. Before, they were defined by the marriage, often diminished, overlooked, or taken for granted. Post-split, that external definition vanishes, and they're forced to confront who they are without it. The 'became everything' part is that explosive moment of self-actualization, where they take all the traits the ex or society deemed flaws or weaknesses—ambition, ruthlessness, creativity, even just plain old stubbornness—and weaponizes them for success. It's less about changing who you are and more about finally giving yourself permission to be that person fully, unapologetically.
I've seen versions where the ex sees the glow-up and feels instant regret, which is the ultimate narrative payoff, but the real satisfaction is internal. It's the protagonist realizing their own capacity, rebuilding a life on their own terms, and discovering that the 'everything' they become was inside them all along, just buried under years of compromise. That shift from being seen as 'part of a pair' to being a formidable, complete individual is the core of the transformation.