The Great Gatsby, talked over and around

I'd like to know the meaning of "over and around" in the following excerpt from the last chapter of The Great Gatsby:

There was one thing to be done before I left, an awkward, unpleasant thing that perhaps had better have been let alone. But I wanted to leave things in order and not just trust that obliging and indifferent sea to sweep my refuse away. I saw Jordan Baker and talked over and around what had happened to us together and what had happened afterward to me, and she lay perfectly still listening in a big chair.

Thank you.