It seems most likely that he was bound to her by the promise he had given to Paddy and that his promise was reinforced by his love for her as his second mother.
Более правдоподобным кажется то, что он был привязан к ней из-за обещания, данного Пэдди, и это обещание зажгло к ней любовь, как ко второй матери.