Unrequited love
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Unrequited love is love to which one receives no reciprocation, even though it is desired. This often leads to depression, anxiety, swift changes between deppression and euphoria, mood swings, etc. Such love arises only when conditions and criteria are involved in the process of gaining or giving love.
In literary technicality, it could be described as the opposite of 'agape' or 'unconditional' love. Hence, this love could be sustained by the lover only to an extent, till he receives reciprocation from the loved (consummation) or develops lesser positive feelings for the loved (starvation) or canalises his feelings towards another, more reciprocative, object (transformation).
Unrequited love leads to a feeling of emptiness or an emotional void that neither medicine nor counselling can heal. Most people believe that it just needs love to fill it. Some religious believers believe that God, with His perfectly unconditional love, is the ultimate answer to a person dragging along with unrequited love.