I like to think that Klein saying he can't go back to the church when Leonard just assumed that they were only temporary separated by circumstance and the need to get revenge is partly why Leonard is so listless.
It was literally Leonard saying "Come back to me. Let's be pressed back to back, side to side. Partners though it all. Life and death."
And Klein slowly lowering Leonard's hands that had clenched on to his coat and going "To much has changed. No matter what I can't stand beside you or anyone anymore."
And then I threw up.

















