[ The statement sends him into another mathematical spiral of trying to understand what it means. Feelings had always been elusive to him, in part because he purposefully distanced himself from them, and partly because feelings had never been a Time Lord's forte. It was perhaps a miracle (or the greatest disappointment if you were in the company of other Time Lords) that he had gotten as far as he had with feelings to begin with.

He worries for a moment that she means he's the cause of her ire and potential tears (he has not forgotten their adventure on the Orient Express and the confusing expression on her face, nor what he's been sentenced with). Being the cause of many people's sorrows and disappointments isn't new and he is under no impression that that will continue.

But then she dispels that worry with her next sentence and something warm flickers to his face. Warm fondness that is more of a promise than he could ever provide with his words alone. ]

We have, haven't we? Boredom though... [ He tilts his head slightly pulling a face. ] I've had enough of that and we've only been here a months. [ It has not been a couple of months. ] Wandering seems like the only cure for boredom right now.