" What exactly do you do for him? Why does he need you?"
Martha was speechless. She could feel her heart splitting in two. He was right. Why did the Doctor need her? What did she do for him? What use was she to him? She was just some stupid tag along. She wasn't Joan. She wasn't precious Rose. She was nothing to John Smith. She hadn't ever been anything to the Doctor. She never had been. She never would be. She breathed in, knowing there was only one thing she did for the Doctor.
" Because I love him."