Steel.

I'm not exactly sure what happened I'm not quite sure what changed, But something in my mind has shifted My thoughts have rearranged. At first I thought I'd lost it all My will had gone away. There was nothing left to do and nothing left to say. You came around and I would cry I thought I'd loved you so; But something in my tears was wrong - They came not from my soul. But every night the tears did fall; I knew the pain was real, But it was quite unusual As if my heart was steel. To penetrate my heart, pain tried But I did not let it so; To let it in and rot my core Would hurt more, I did know. My heart was bound in lengths of steel, though blood pumped mighty strong. It stayed secure, for I did know that eventually you'd do me wrong. And when you did, no shock to me, I saw straight through your lies My head was hurt beyond belief; My heart just said "Nice try."