Someone who will make you trust them and rely on them, and then betray you. They will be by your side for years and then all of a sudden, turn on you. They will break you down and then play victim, leaving you with many insecurities and issues.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)