Mimicry

Mimicry: what one does, unconsciously, when in love, to let the other one know his or her intentions. When one does not mimic the other one, in the length of writing (when talking through a chat box of any kind, for example), his or her brain notices an imbalance, as if something weren't working well.

This is why, one must do it consciously, at times. Otherwise, the end of that nourishing relationship becomes inevitable.