To me this song about someone who has given their all in relationships of the past and had been hurt in all of them that when finally someone she meets is willing to give everything of himself to make her happy as well she cannot see it because she has locked her self up so as not to get hurt again. He is saying that he knows and understands what she has been through and he wishes to love her and make her happy but she just brushes him to a side as in a memory. Sometimes we tend to see further than what is expected. Sometimes we search and we search for someone when the person we are looking for is right in front of us.