Limerence. How ironic, such delicate yet powerful emotion, almost bordering on the state of obsession. Check the more scientific meaning by wiki-ing it.
Here're some statements in the article which describes the word.
Limerence has certain basic components:
-intrusive thinking about the limerent object
-acute longing for reciprocation
-some fleeting and transient relief from unrequited limerence
-through vivid imagining of action by the limerent object that means reciprocation
-fear of rejection and unsettling shyness in the limerent object's presence
intensification through adversity
-acute sensitivity to any act, thought, or condition that can be interpreted favorably, and an extraordinary ability to devise or invent "reasonable" explanations for why neutral actions are a sign of hidden passion in the limerent object
-an aching in the chest when uncertainty is strong
-buoyancy (a feeling of walking on air) when reciprocation seems evident
-a general intensity of feeling that leaves other concerns in the background
-a remarkable ability to emphasize what is truly admirable in the limerent object and to avoid dwelling on the negative or render it into another positive attribute.
Now, that's a new word learnt and some food for thought...