Can Anyone Explain No No No

I saw the harbor lights They only told me we were parting The same old harbor lights that once brought you to me I watched the harbor lights How could I help if tears were starting Goodbye to tender nights beside the silvery sea I long to hold you near and kiss you just once more But you were on the ship and I was on the shore Now I know lonely nights For all the while my heart is whispering Some other harbor lights will steal your love from me