His Attitude ChangesIf he is normally a down-to-earth kind of guy and is comfortable with speaking to you face to face, but suddenly starts to mumble when he is telling about his day, he could just have a tooth ache, but if not, turn on the observation radar. He may then try to distract you in the middle of his explanation, complimenting you on your new manicure that he never regularly notices. This may be an attempt to drop the subject. He may also seem fidgety, sweaty, or unusually agitated.
Lack of Eye ContactI know a couple of people who do not meet me eye-to-eye, simply because they are shy. But you know your guy. If he has a hard time making eye contact when you are wondering why he ditched you on date night, then he very well, may be conjuring up a story. This sign also shows the person to be a bad liar. Not only that but they are afraid of you finding out by looking into those peepers. The reason for this is, he knows that you notice a change; a shift in the axis of your relationship and that his behavior has been different.
Response DelayWhether you are texting or speaking in person, long pauses are definite lie indicators when it involves
you searching for relationship reassurance. He should not have to think about his feelings for you or
about what he did while out with the fellas the night before, when he didn't come home. Truth flows easily from a person's mouth. They should not have to ponder it.