If you dream bug crawling into ear, its dream interpretation means you have to pay attention to something that was said to you earlier. Perhaps you’ve gotten a stimulus that made a connection to old information. This dream imagery is a message telling you to take notice of your ear, and what you’ve heard.
Another dream interpretation is to pay attention to your physical ear. You might have to clean your ear, to get rid of the bug. Of course, there’s only a remote possibility that a real bug crawled into your ear, as this dream imagery was invented to relay a message to you.