Liars are very good listeners
Despite the fact that most people would tend to disagree with it, the best liars are incredibly good listeners. And if you think about it, it makes all the sense in the world.
If they LISTEN to the ones around them, it will be much easier for them to fabricate stories, and they will find out a ton of information they could use in the future.
They will also know exactly what to say and what to hide, to make you believe them right away. And the best way to do that is to study you. This way, they’ll know just what to do to manipulate your actions and emotions.