"She's my responsibility, right? If my sire's running loose around here, it seems good and proper I see to it."

He loved Buffy too much to use Drusilla against her. Or maybe he loved Drusilla too much to use her against Buffy. Or more likely, he'd learned his lesson in that tomb four years ago when he tried to prove his love with a stake to Dru's heart.

Either way, his tone was completely sincere. He may have been intending to leave in a huff, but it was for good reason.