"Indeed, even if [the defendant] had made an explicit promise that, upon separation, [the plaintiff] would be entitled to 'equitable distribution' of their assets, it would be unenforceable, as it would be contrary to the long-standing law and policy in New York that unmarried partners are not entitled to the same property and financial rights upon termination of the relationship as married people," Justice Gesmer wrote in Ericson v. [read post]