On first reading, I found this a bit disturbing: I couldn't handle Rose's attitude to the blue-suited Doctor, because I didn't think she'd be that lacking in compassion.

However on second reading, I agree that of course she would do that, had she been given the opportunity (or not been so distracted by the kiss). The Doctor in the TARDIS is the one she loves, and she'd do anything - and, more importantly, abandon those she loves - to be with him.

I love the fact that the Doctor gives her the choice, though, once he's realised her intention, to stay in Pete's world. He's learning ;)

Now I'm wondering what will happen with Donna, now that Rose is there ....