Shaayar Qasir seems to be capturing the vulnerability when in the depths of emotional deprivation. He says even a simple smile from someone evokes a profound feeling: an illusion of love. 

The contrast between mehroomi (deprivation) and mohabbat ka gumaan (an illusion of love) highlights an insecurity so deep that any gesture of kindness is misconstrued as affection. 

It speaks, when isolated, of a longing for connection and the mind's tendency to find solace, even in fleeting moments of perceived warmth, even extended as a formality perhaps.