A person whose words have been shown to contradict his or her actions is one you're better off without. Maybe it's the girlfriend who professes to love you but always misses your milestone moments. The friend who talks up your being best buddies, but has been caught spreading lies about you. The co-worker who assures you that you can always count on them, but is furtively angling for your job. The truth is that it's not always easy to decipher people's real motives, especially when you don't know them that well. But once you observe on more than one occasion that their actions don't mirror their words, you ought to cast a wary eye. People can make promises all they like, but if there's no action to back them up, it's evident they've got a penchant for disingenuousness. Don't be too quick to hand over your trust. We are much more apt to do this when the person in question is charming and charismatic. A rule of thumb to go by: You don't real...