they also had a book deal together. Like all the entanglement of an engagement and also that too. Not trying to make Lizza, noted sex pest, out to be clean here but an affair wrecking a betrothal and a book deal leaves a lot of material for someone to spin "settling financial matters" as blackmail

and unlike a crumbling marriage there isn't a lot of regularity to how those gets sorted out. Who's left holding the bag for breaching the book contract, for example?