No looking back. Life goes one way only, and whatever opinions you hold about the past having nothing to do with anything but your own damn weakness. Nothing changes what already happened. It will always have happened. You either let it break you down or you don't.
The past is a stronger influence in the South. But I think everywhere you have this sense that the world changes faster than you can accommodate yourself to. Looking back and seeing how you got where you are is a useful way to combat disorientation.
And then she thought that you went on living one day after another, and in time you were somebody else, your previous self only like a close relative, a sister or brother, with whom you shared a past. But a different person, a separate life. Certainly neither she nor Inman were the people they had been the last time they were together. And she believed maybe she liked them both better now.