A short, finished list rather than an endless feed: 13 of the best unrequited love quotes ever written, picked out of the full unrequited love archive on QuoteForever. You will find Meg Cabot, Alice Hoffman, Frank Ocean and David Duchovny among them.
Read the list top to bottom, or use it as a starting point - every author name links to everything else they said, and every quote has its own page you can share or turn into an image.