Billionaire Sid Bass accused of breaking lifelong-support pledge with former partner

New York interior designer Oona Sperr is suing Texas oil heir Sid Bass in Manhattan federal court, alleging he promised lifelong financial support and shared ownership during a decade-long relationship but abruptly cut ties after starting a new relationship, offering a far smaller payout and a maintenance-style arrangement. The complaint cites lavish shared properties, gifts, and alleged coercive behavior by a third party, and seeks at least $400 million in damages plus ongoing support, framing Bass’s pattern as a repeated cycle of marriages, infidelities and replacements.