The end of the world is a terrible place for a first date, but that’s the point. The Doctor wants this thing with Rose to be real, so he shows her exactly where he comes from. He shows her what it means to watch your world burn. Then he takes her back home to the people and the concrete, pressing her on every side with all of the noise and life that she just lost. That’s the Doctor’s loss, and he waits to tell Rose until he feels she can really understand. Surviving means caring about things that literally no one else cares about. It means being on a ship that treats the loss of your world as high-class entertainment. It’s not just about being the only one to know the planet: it’s about being the only one to care.