He might as well have just forgotten about her the way her face falls.

It's hard, keeping her emotions separate enough to identify and deal with them. To keep them calm. But Rose does action first, and separating the emotions and the why's later.

So there's an obvious barrier on her face, a chip on her shoulder, where she's gone dark and cold too. "Then turn around and go back through the gate. And when you're done trying, because some silly tiny part of you that you refuse to acknowledge still wants to be here... then come find me."

And she just turns to leave.