Same Difference
She knows it shouldn't matter.
His new regeneration will still be him, that's what he'll tell her.
And maybe one day she could get used to it.
But it won't be the same. He won't be the man she fell in love with. Not really. It's funny how sometimes people can feel so different, a completely different person and you're only the wiser by the loneliness in your chest.
And that does matter no how much she tells herself differently.
He's dying.
Donna is asking what to do, how to help him.
He's dying.
She knows what happens next.
He's dying.
Jack finally has to pull her away from his body.
He's dying.
A golden flash of regeneration energy, and a few moments later he's still the same.
Same (great) stick up-y hair, same smile, same pinstripes, same hands that fit perfectly into her own.
She smiles.
He's alive.