7. He Acts Defensive
If you’re trying to figure out how to tell he’s losing interest, you have to pay attention to his behavior. For instance, does he overreact to simple questions? Does he seem reluctant to share any information with you? He could be feeling guilty, not even necessarily because he’s cheating or interested in something else. He may just be reacting because of the increased tension that comes from his knowledge that he’s not interested in the relationship but hasn’t said so.