Devious Underbelly

Have you ever had people in your life whose actions in and of themselves are very nice and caring, but for some reason you doubt the sincerity of their offerings or sense that there is some sort of hidden agenda. I have that with this girl I know, and I can't quite put my finger on why that is (and I also seem to be the only one who notices). Maybe because I've seen her in different situations where her fangs have come out, and have heard the negative undertone with which she speaks about others who seemingly she likes. It's very hard to say. Or perhaps it is my own insecurity and trying so hard not to be fake that I'm projecting it onto her.