Every time I returned from work trips, I noticed subtle changes in my dog, Bella. She’d come back freshly groomed, wearing new bows, and smelling faintly of perfume. My husband, Jason, claimed he was bonding with her, though he’d never shown much interest in Bella before. One day, a new collar with a heart-shaped charm caught my eye. Inside, a note read: “YOUR HUSBAND IS A CHEATER.”