I don't know if articles like this should reassure me or make me feel even more stupid. Caroline Presno has obviously dealt with this type before.
To whit: (emphasis mine)
When I advise women and men about how to avoid someone with sociopathic tendencies, I tell them don't expect a monster; instead expect someone oozing with charm. Yet, underneath the heat and charisma are cold thoughts and actions devoid of empathy. Impulsivity, thrill-seeking, and constant boredom are characteristic.
Relationships are used as stepping stones to get them where they want to go. They have an uncanny ability to push someone to the brink, but then suck them back into the relationship again. It's drama, and they love it.
Boy, it's like she was there.