Jo Grant
He didn't think he'd ever felt quite so alone before.
While he would have loved to have stayed at the party to celebrate Jo's upcoming wedding to Clifford, he hadn't thought he was quite as welcome as the others. He had been the outcast, outside of the others. The alien, so to speak, in the midst of it all.
Instead he had wished her happiness, given her the blue sapphire from Metebelis III and vanished off into the night, when her back was turned.
No matter how much he had tried to stay apart from the others, as he had found when he had gotten the TARDIS in working condition again, he couldn't completely stop himself forming these little attachments. And those attachments were going to lead him into trouble one day. Further trouble, anyway.
Oh, Jo.
He'd gotten more attached to her than he had ever thought he would. He cared for her like she was a daughter to him. In the human sense, not a Time Lord one. He seemed to be going slightly native...
Well, he was bound to find someone else soon enough. Someone just as uplifting and energetic. And, hopefully, someone just as good at getting out of a sticky situation.
Too bad that right now he didn't want someone else.
What he wanted right now was to get back to his TARDIS, travel to some uninhabited world a galaxy away and have a proper sulk over this.
He only hoped Jo would forgive him for walking out on her like he had.