As much as we dread being the bearers of bad news, there is a possibility that you may have have fallen madly in love with a sociopath. Not every sociopath is psycho criminal, but they are definitely no fun to have around. According to clinical psychologist Martha Stout, Ph.D., 1 in 25 people are sociopaths. Even if you aren't dating one now, chances are you have come in contact with one in the past. Our advice? Know what makes them tick. Take a look at this list of signs that your significant other is a sociopath.