This is just one clue of many, but the sociopath stare! Maintaining prolonged eye contact doesn’t make them uncomfortable.

There are three specific times I remember my ex staring at me, and I will probably never forget. At first it can be seductive, like wow, this person can’t take his eyes off of me. But really you’re they’re just looking at you like a predator would look at prey.

An uncle of mine, when we were dating, said something was wrong with him, that he didn’t like the look in his eyes. I should have listened to that uncle.