I don't see a way to get the results from Graph Builder either. Another approach is to use Tabulate. Drag your X variable to the columns area. Drag your Y variable to the rows area. Drag your response to the center of the table. Then drag the Mean statistic and drop it on top of the Sum label to change to the mean.
There may be some additional work if you need to bin your X and Y variables. That is where the Cols > Make Binning Formula could be handy, too.
Dan Obermiller