Bellatrix só amava Voldemort; seu casamento foi para atender às expectativas de sua família e cultura puro-sangue.
Rowling respondeu isso em um webchat ao vivo em 2007, transcrição no Caldeirão Furado :
Isabel: Did bellatrix ever love her husband, or did she have love only for voldemort
Rowling: She took a pureblood husband, because that was what was expected of her, but her true love was always Voldemort.