In the books he called her Bella and he actually grabbed her hand in Malfoy Manor to which she aggressively responded by telling him to take his hands off her. There's sexual tension here.
“I was about to call him!” said Lucius, and his hand actually closed upon Bellatrix’s wrist, preventing her from touching the Mark.
“I shall summon him, Bella, Potter has been brought to my house, and it is therefore upon my authority –”
“Your authority!” she sneered, attempting to wrench her hand from his grasp. “You lost your authority when you lost your wand, Lucius! How dare you! Take your hands off me!”