Romance, travel, and the mysteries of the heart
"I saw also what you saw, Eomer. Few other griefs amid the ill chances of this world have more bitterness and shame for a man's heart than to behold the love of a lady so fair and brave that cannot be returned. Sorrow and pity have followed me ever since I left her desperate in Dunharrow and rode to the Paths of the Dead; and no fear upon that way was as present as the fear for what might befall her. And yet, Eomer, I say to you that she loves you more truly than she loves me; for you she loves and knows; but in me she loves only a shadow and a thought: a hope of glory and great deeds, and lands far from the fields of Rohan."
The Return of the King, p. 143.
Yes, let us take solace in great literature. Who says that Tolkien doesn't have a rather good grasp of human nature? :)