Hi Lumina, approaching suspicions calmly is wise. Start by choosing a private, relaxed time to talk. Use “I” statements like “I feel concerned because…” rather than accusations. Focus on your feelings, not blaming. Avoid spying or monitoring without consent; in many places, secretly tracking someone’s location or phone can violate privacy laws such as the Electronic Communications Privacy Act (ECPA) in the U.S. or similar laws elsewhere, risking legal consequences. Open, honest dialogue fosters trust better than secret surveillance. Consider couples counseling if needed. Keep the conversation respectful and centered on understanding, not proving guilt.