He explains this on iTunes. Its about his loss of innocence. He's realized he's at a time in his life that he has made such a mess of his life that any woman he meets from now on will not be able to completely know his future, they will just have to let some things go. "There was a time when I had nothing to explain"...."my innocence has all but faded; oh this mess I have made." Then at the end he talks about his new relationship how there are things he still has to hide, and regrets that he couldn't hide them in his last relationship. The part about God is saying he can't just be saved and forget about all this mess because he doesn't believe in God.
He explains this on iTunes. Its about his loss of innocence. He's realized he's at a time in his life that he has made such a mess of his life that any woman he meets from now on will not be able to completely know his future, they will just have to let some things go. "There was a time when I had nothing to explain"...."my innocence has all but faded; oh this mess I have made." Then at the end he talks about his new relationship how there are things he still has to hide, and regrets that he couldn't hide them in his last relationship. The part about God is saying he can't just be saved and forget about all this mess because he doesn't believe in God.