Narcissa leaving was no shock to Bellatrix. Yes, she was meek and spineless, but even the best woman would not take being mistreated and cheated on forever. Though the fact that she wanted it to be quiet made things drastically better for all involved. The only part that truly worried her was when he said she wanted to take Draco, her Draco. The boy that held her new child, that warmed her bed each night, the one who kept Harry so happy. As much as she wanted to keep her affairs with Draco a secret, she knew this was the only way that the boy would be able to stay in the manor.