If you want to know if a man is cheating... listen to your gut.
If you want to know if a man is in love with you... listen to your gut.
If you want to know if a man is honest... listen to your gut.
Research has shown, time and time again, that our bodies can pick up information long before our conscious mind is aware of it.
Let me be a little more clear....
Our bodies are constantly picking up all sorts of information through our senses. We are literally bombarded with thousands of bits of information that our brains do not bring to our conscious awareness. Right now, your body has a sense of your form in space (proprioceptive information); your skin is receiving information concerning textures, temperature and weight; your eyes can see much more than you need to at this particular moment; your ears are receiving sounds you are not paying attention to. All this information is entering your brain, but your brain learns to tune out that information which it does not need in your conscious awareness at this moment.
But, what we know is that the information is available and your body responds to information without your consciousness being a part of the process.
When someone is lying, even before you may "know" it consciously, your body often will show signs of stress. If someone is interested in you, your subconscious can pick up clues of which you are completely unaware. Your senses are picking up all sorts of little nuances, glances, facial expressions, and a host of other non-verbal clues and signals.
Here is what sometimes happens... you get a certain sense (your gut tries to tell you something), but your mind second guesses what is going on. Why? Because the information may be something you don't want to hear, your mind may not want to believe it, or your emotions do not want to face it.
So, your brain ignores, represses, denies, or doesn't listen to what your body and instincts may be telling you.
Now... while I often suggest you "listen to your gut", I'm NOT suggesting you go overboard and stop thinking or go with every little quirky thought that crosses your mind. Please take note! I'm suggesting you listen to your instincts and take in what your body may be telling you. "Listen to your gut," doesn't mean be stupid!