it isn't love at all. It is a crush, an obsession, an infatuation. Real love has to be mutual. It is impossible to have one-sided love. Love by its very definition must be returned. It is shared. love that is not returned or understood as such, even though reciprocation(returned)is usually deeply desired. The beloved may or may not be aware of the admirer's deep affections.dictionary defines unrequited as "not reciprocated or returned in kind.Like in the Great Gatsby, gatsby has a relentless unrequited love with daisy.Unrequited love can result in obsessive behavior such as stalking and even transform into hostility toward the object of desire if the love is rejected. These sorts of behavior can lead the afflicted person to be seen as "perverted" or to a lesser extent.
http://neonights.net/dating/guide/Unrequited_love.html
http://www.goodreads.com/review/show/17473084
http://en.wikipedia.org/wiki/Unrequited_love