My favourite thing about the Bad Wolf storyline is that the creation of Bad Wolf itself wasn’t even the biggest proof of love from Rose in that moment and that says a lot because looking into the Heart of the TARDIS isn’t nothing.
But the biggest proof (in that moment) that Rose loved the Doctor was this:
She saw everything.
The worst he ever had been, the worst he ever could become.
She saw the timeline were he left her in Pete’s world. (since she named it Bad Wolf after Bad Wolf bay. )
(Which makes me think that she might have had to hand pick that timeline in order to save him)
She saw him break her heart, she saw him kill, die and hate everything and everyone because he couldn’t face hating himself.
She saw all of him. (The very thing he thought would make her leave him)
And yet she still came back to save him.
