My girlfriend dumped me over mystery sexts on my second-hand phone – but I never sent them

DEAR DEIDRE: MY girlfriend thinks I’ve been cheating because my second-hand phone still had the previous owner’s ­messages on it. I bought the device in good faith on Facebook Marketplace. It was immaculate and I collected it from a house nearby. I’m 34 and my girlfriend is 40. She was married but that ended when...