"And you really didn't think it would happen, but it really is the end of the line."
As she screamed and felt the pull of the void, Rose wanted to say something more than an anguished cry. She wanted to say exactly what the Doctor would have said, what he'd taught her to say from the moment she'd met him. No. No, this wasn't fair, this wasn't right. It wasn't supposed to end this way. She'd stuck by him through everything, held his hand when he needed it, saved his life, saved the world. This couldn't be it, she couldn't be leaving him.
She remembered that moment a few weeks ago, when she'd thought she'd lost him forever. The feelings she'd felt had overwhelmed her; she felt like part of her was missing, like a leg or something. She hadn't realised quite how vital the Doctor was to her existence until then. But more than that, she was scared for him. Scared that he was alone now, all by himself. Who's gonna hold his hand now? It broke her heart in two to think that he was lonely.
And now it was all coming true. Even as she pointlessly struggled against the pull of the void, Rose knew what she was fighting for. It wasn't for her life; it was to be the hand the Doctor held. It was to be the one to share everything with him. He'd had other companions in the past, she knew that, he'd find someone else if she was gone. But she didn't want him to have anyone else, she wanted to be his plus-one.
It wasn't supposed to be this way.
Lyrics from "Driftwood" by Travis
Sorry for such short chapters... chapter 6 is longer!