The Collaborative International Dictionary of English v.0.48:

Lovelorn \Love"lorn`\, a.
   Forsaken by one's love.
   [1913 Webster]

         The lovelorn nightingale.                --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lovelorn
    adj 1: unhappy in love; suffering from unrequited love [syn:
           bereft, lovelorn, unbeloved]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "lovelorn":
   adoring, affectionate, conjugal, demonstrative, devoted, faithful,
   filial, fond, forsaken, husbandly, jilted, languishing, loveless,
   lovesick, lovesome, loving, maternal, melting, parental, paternal,
   rejected, romantic, sentimental, soft, spurned, tender, unbeloved,
   uncherished, unloved, uxorious, wifely