When you tell someone I want you back then you are saying that you miss the person and hope to bring them back into your life. There are a variety of I want you back quotes that can be found, and these show that this is a very common emotion that people experience. When someone breaks up with you then you could be left with unresolved issues and old feelings that have not faded. You should never say I want you back to someone who has betrayed you or treated you in a way that is less than what you deserve. If you were the one who broke off the relationship then you may discover you made a mistake, and getting the person back may be important.