Getty Images (2) As a couple, Phoebe Gates and Arthur Donald made sure to support one another's biggest moments before they broke up in 2025. "My boyfriend, Arthur, giving me a lift post-ceremony," Gates captioned a June 2024 photo essay for Nylon from her college graduation from Stanford University. In the snap, Donald gave Phoebe a sweet piggyback ride after the ceremony. "I can't think of a better ending," she gushed to the magazine of her commencement.