Your best friend’s about to be added to that list, but you can stop it, you can save her -- only it’ll cost you both.

I'm as conflicted as Rose about what happened to Donna -- it's horrible, without a doubt, and I don't think Donna would have chosen that outcome on her own. But ... the Doctor's decision was made out of love for her, and some selfishness, and I completely understand why he would be motivated the way he was. You captured this beautifully. Thanks.