Sociopath: a person with a personality disorder manifesting itself in extreme antisocial attitudes and behavior and a lack of conscience.
4% of the population are sociopaths. Okay, so there are different levels of socio, and chances are you haven’t dated a full-blown psychopath. But any amount of socio can take a toll on you. So while you should always follow your own instincts on someone and not base your decisions off a Buzzfeed list, let this serve as a possible reality check on your ex or a warning about future (or current) partners.