The Doctor sipped his tea, he noticed her leave, he felt bad for talking about these things behind her back. He didn't want to hide it from her too long. He was looking at Jack. "Might be a good idea, don't want to hide it from her too long." He knew that they needed to find out.
He looked sad " I Feel sick at thought of anything happening to her and the fact I basically feel like I Abandoned her when she was alive if it is my sister, I tried to forget about her when I thought she was dead."
He felt like he had been a terrible person.