What defines a or a Slut, did I fall for one or is she misunderstood?

Avoid her! If a 16 year old has consensual with another teen it is bullcrap if she has him incarcerated. I am aware that a 19 year old is a legal adult but this will ruin the REST of his life. If he lives to 80 that is 61 crappy years! If she is willing to ruin his life what is to stop her from doing something bad to you. She has no conscience and is bad news. Run far away from this girl.