This song might be about his best friend and how he will always be there. I may be an idiot, but I also think this song is about a girlfriend he loves as a friend and not somebody that he could spend the rest of his life with. After he broke up with her, she takes it a lot harder then he and, he says, "I'm here for you so don't forget". Also, "Because you know that life ain't over yet I'm here for you so don't forget." could be a way of saying that she will find someone and he will always be there for her.
This song might be about his best friend and how he will always be there. I may be an idiot, but I also think this song is about a girlfriend he loves as a friend and not somebody that he could spend the rest of his life with. After he broke up with her, she takes it a lot harder then he and, he says, "I'm here for you so don't forget". Also, "Because you know that life ain't over yet I'm here for you so don't forget." could be a way of saying that she will find someone and he will always be there for her.