"Unless one side meets someone very special and discusses with the other before anything happens."
I suppose that part was her idea? If your W comes to you abiut finding someone special, then she has already crossed a line. Hate to say this, but there may already be an OM in the picture. Stay faithful until January 2018? How about staying faithful until the MR officially/legally comes to an end. I'm guessing these are your W ideas?