Love would never willingly accept its own unconditional, complete defeat; their heart too must be part of this conspiracy, for this cannot be the work of glances alone.

Love is fiercely proud by nature, so it would never concede such a total, unconditional surrender without a fight. The poet playfully suggests that this sweet defeat couldn't have happened merely from a passing exchange of glances. The beloved's heart must have been secretly plotting all along, quietly inviting this beautiful capitulation.