I believe the Ann Rutledge story but think the evidence does not permit us to say that Lincoln was subsequently incapable of forming loving attachments. I did not know of the 1862 Hill story. It is fascinating that Randall and co. demanded a higher standard of proof over Ann Rutledge than other events in Lincoln's early life.
Did Nicolay &Hay address the Ann Rutledge issue? We know they gave Robert Lincoln editorial control of their work and we know his sensitivities regarding the family background and history.
Tom