What some people failed to mention is that She got her heart broken right, well she wants to help the other girls that got their heart broken by the same guy. She was cheated on and was sad, but she realized she had to get on with her life insead of holding on to someone who did not lover her to begin with.
I can sort of relate to this song in a way. I listen to it every day and I just think of my past and laugh. I had my first boyfriend when I was 14, and this guy was just using me to make another girl jealous. Then had the nerve, 2 months later, to ask me out. I said no and he said I am nothing without him and I laughed and I said to him "Wow, you are really insecure. You keep thinking that to make yourself better." And every now and then I get a message from him on facebook of him trying to manipulate me to be with him. I'm 17 and I don't need a man right now. I'm waiting for "the one".