Rose couldn't believe what she was hearing from this man she wouldn't have recognized if he hadn't changed from the Doctor she'd known and loved to this stranger right in front of her. Her Doctor - no, her and Jack's Doctor was gone and what's worse is this new guy had left Jack behind to fend for himself, not even giving him the courtesy of explaining to him what she'd done to him or why he apparently wasn't welcome on the TARDIS anymore.
It wasn't that she doubted Jack's ability to land on his feet, he'd be fine she was sure but that wasn't the point. Jack didn't deserve to be abandoned without explanation of why by the people he loved. He didn't deserve to be left untold about his new future only to find out when he inevitably came back to life. Not to mention the fact that not knowing about that ability could be dangerous in of itself if Jack wasn't careful.
Then there was the fact that while Jack would bounce back physically, the emotional damage would be irrevocable. She and the Doctor had worked hard to get Jack to trust them, to open up to them, to break the wall of mistrust the betrayal of the Time Agency had inflicted on him. And it scared her that this new Doctor was callous enough to run away without even a goodbye all because of the immortality she herself had inflicted on their lover.
She shook her head against the guilt bubbling inside her, Jack would now outlive all of the Doctor's regenerations thanks to her just wanting him to be alive. She wasn't sure which was worse, having lost him on the Gamestation or forcing him to lose them and anyone that could come after them. Making a decision, she says,
"Take me back." The Doctor looked at her for a moment before responding,
"He may not even be there anymore." She met his gaze. It was clear he didn't want to lose her too but he really should have thought about that before leaving the last of their trio behind without even a by your leave.
"Then track him down, and take me there. I have to see him, explain what I did to him. I know I won't be able to stay with him forever but I still love him; I won't abandon him."
"You think I don't still love him?" He glared at her, she could see he resented her implication.
"Then show it." She said.
"Rose, you don't understand, he's a fixed point in time. He'll always grate against my senses. It can't be the same, no matter how much I want it to be."
"You really think that's the problem?"
"It's not?" She rolled her eyes.
"We always knew this wouldn't last forever, Jack would understand that. The problem is you running away from telling him why it's over. You don't do that to someone you claim to love."
"What would you have me do Rose?"
"Take me to him, then be prepared to drop him off where and when he wants to be. It's what you'd have done when he first joined us, even before feelings came into play. Surely that's the least you can do now." She smiled as he nodded.
