Quite simply, a traitor
who seems to be your friend when things are going well in your life, but will ditch you the second things start to look bad. Fair-weather friends are often very selfish with sociopathic
elements in their personalities, and are usually on the prowl for a poor tool
to take advantage of. He/she won't miss an opportunity to use someone to get something. Watch yourself, or you could be the next victim!