Ben shook his head, "No, I want to help you" he said honestly. It was difficult to explain but as a slave Ben had grown up so differently to London. And as such some things he held true in his own mind would be hard for Ben to explain or make his master understand.
Had London done anything maliciously then Ben would have wanted to get away and be on his own but he knew London was upset and he didn't resent him for using Ben to make himself feel better.