I certainly should have,' he agrees, smiling and thinking...

I certainly should have,' he agrees, smiling and thinking what an absurd and universally-accepted bit of nonsense it is, that your best friends must necessarily be the ones who best understand you. As if there weren't far too much understanding in the world already; above all, that understanding between lovers, celebrated in song and story, which is actually such torture that no two of them can bear it without frequent separations or fights.