4. Ask him questions to show that you care. One way to tell your crush you like him is to show a genuine interest in him. To do this, you should simply ask him questions about his life and make an effort to really listen to the answers instead of planning your next move.. Make eye contact—and then break it. One way to let your crush see that you like him without opening your mouth is to simply lock eyes with him. Make eye contact for just one or two seconds—just enough time to show you’re paying attention—and then look down at the floor or just avert your gaze.