A person who likes to play with peoples emotions until they gain feelings for them. Proceeding to end it the second they do. People like this usually suffer from Peter Pan syndrome because they just can’t seem to grow the fuck up and actually be a decent human being.
It doesn’t necessarily mean playing with someone’s emotions. It’s staying cool, calm, and collected whenever dealing with bullshit. It’s also portraying an act of silence and falling back when noticing pure fuckery.