Photo by Kevin H..Maybe we should have known that it was too good to be true, something that was never meant to last. Our own utopian vision of a perfect summer romance — a riveting and competitive campaign by our Washington Nationals — seemed less like a pipe dream after Baseball Prospectus’ highly-anticipated PECOTA projections predicted that the Nationals would finish the season with a record of 82-80. PECOTA even suggested that the Nats would…