7. Ask if he’s been on a date with someone while looking at a receipt: “Who did you go to this café with?”
“If it’s the receipt from the kind of café that would be popular for dates, it’ll be even more effective.” Show him the receipt from a café you don’t usually go to, and watch his reaction. If you don’t have a receipt to show him, casually ask him, “You went to that café, right?” and he may display suspicious behavior.