Wikipedia

‘Platonic friendships provide a fertile soil for unrequited love’. Thus the object of unrequited love is often a friend or acquaintance, someone regularly encountered in the workplace, during the course of work, school or other activities involving large groups of people. This creates an awkward situation in which the admirer has difficulty in expressing their true feelings, a fear that revelation of feelings might invite rejection, cause embarrassment or might end all access to the beloved, as a romantic relationship may be inconsistent with the existing association.