Actually if you watch the music video you can tell the meaning from the start. Basically the girl had a boyfriend and they were so close to each other and the really love each other but the girl's dad made the boy to leave. Being close to someone hurts specially if you two will just break up even though you still love each other. It's hard to let go and everyone knows it. For the girl being close and having a relationship with the boy hurts. Not because they don't love each other, but because they loved each other so much but the dad won't allow their relationship. But she needs to understand that every parent wants nothing but for the good of their child, for the future, for their life. This song can really be used specially if someone is hurt or in any problematic situation like having your parents divorced, knowing that one of your parents have a different child from a different wife/husband, breaking up with someone you love. I really like this song cause it really puts out all the pain that you've receive. You will learn that if you feel like there's nothing you can do, let it go, it's the past.