Sarah Jane
Circumstances come along and I can't keep people with me all of the time, as much as I want to. I'm always going to be blamed for dumping everyone off, but I don't want to watch any of you die. I watched her, that was painful enough. I watched all of my people perish. That was quite enough, too.
It doesn't matter anyway. I could spend the rest of your lives apologizing and it'd never be enough. Just really how many of you lot want to be close to me? This me and not because I'm the Doctor? Everyone seems to be in love with the stupid walking stick later one and that's fine and dandy. Have at him. Enjoy him.
You didn't even once speak to me since I've been here so you cannot be angry at me for ignoring you. Didn't see you jump to talk when I first showed up.