6. “I’m just curious what kinds of messages you send to other girls.”
This strategy focuses on things you want to know when asking him for his cell phone. Even if he doesn’t like the idea that you might go through everything on his phone, he might say, “If it’s just the messages, that’s fine.” This should be effective if your boyfriend gives in to pressure easily and often says, “If you say so.” However, it’s also possible that the proof of his infidelity lies outside of where you’re looking. Make sure to check beforehand what correspondences seem suspicious.