The hidden secret of love, which had been preserved for a hundred days, was revealed due to the heart's weakness/inability to contain it.

This profound couplet speaks to the terrifying vulnerability inherent in love. The 'secret of love' (raaz-e-'ishq) is something precious, something guarded. Mir Taqi Mir suggests that this deep, hidden truth—which felt safe—was lost over time. The ultimate culprit isn't external pressure, but the sheer weakness or helplessness of the heart itself, which simply opened up the curtain and revealed everything!