On Love and Time Travel

From Foucault's The Use of Pleasure: The History of Sexuality Volume 2
Issues of timing that occur in relationships. 

The opportune moment (kairos) as the concern of diatetics
The continual maintenance in relational structures of economics
The problem of the limit of erotics

This limit, as Foucault describes, is a feeling of anxiety that is connected to the fleeting moment of love.  And love is connected to the ever-elusive character of desirability. In love exists a double-sided fear; that the lover may lose his charm and that the beloved may lose interest in him. This is the limit of love and passed love is friendship. This limit is not so much an end as a point of departure, a relationship that exists post-desire. That the limit is accounted for in the structure of the relationship, once desire dies, respect and admiration take its place. Love in all its complicated mystery, like comedy, is about timing. Although without end, love accounts for the death of desire, like a doomed, disappearing bond, longing becomes the moment of love-lost. Is it not impressive, that the Greeks would account for the limit of desire and the taking over of friendship, calling both love?