I reckon that Harry will kill Elena or Sasha and be blamed for the diplomatic fall out that comes with it and following that i think Harry and Ruth commit suicide on the cliff or fake their own deaths. The line that goes something like " lets go somewhere we can be together away from the service" strike me as maybe agreeing to top themselves. I think Harry knows it will come to this as having the CIA chasing him, the deferred case surrounding Albany and the Gavrik situation, the only way out is to disappear or end it. Maybe the scene in his house was him clearing any evidence or trace of his past? Might be way off with this but starting to make more sense to me!