I don't know why, but every time I hear this song, I interpret this song as he's basically a heartbreaker. So, basically, he builds coffins because, when you break someone's heart, it feels like a part of them die, and you just have to bury the pain and memories. It's saying that he breaks everyone's hearts. He's a charmer, that it doesn't matter who you are, he'll make you fall, and he's eager to please you. And it's not just a game for him, it's become a way of life. She knows that he's gonna break her heart one day as well as everyone elses, and she's saying that she thinks in the end, he's gonna break his heart as well. Some say that it's a blessing and some say it's a curse because it sets you free, but it leaves destruction in it's path. And no two heartbreaks are the same. She thinks it's a shame because he spends all his love and care on a relationship, but then he throws it away and can't ever get it back. Just my personal opinion, but anyone else agree? :)