3. When answering your questions, their answers are vague and their eyes get shifty.
When answering a question, a person’s eyes will shift toward the side they are accessing information from. Eyes that move to the right are searching for memories, whereas eyes that move to the left are creating lies. If your partner’s answers are vague or unusually detailed, this may be a sign that they are trying to cover something up. Another telltale sign is when they answer your question with a question, because they’re trying to get extra time to make up lies.