Jealousy is an emotion which is very negative, and it is something that feels like envy. When you are in love with someone but they pine for someone else they you will probably feel jealousy over this fact. The numerous jealousy quotes that can be found online show that this emotion is common in humans, and even when we try to avoid it this feeling can not be pushed aside. Sometimes jealousy can make people do stupid or even evil things, and it can turn into obsession or even stalking if the jealousy results from a love that is not returned. This negative emotion is sometimes called the green eyed monster, and it can make people do things that they ordinarily would not do in a moment of jealousy.