The Greek epigram intimates that the force of love is not shown by the courting of beauty, but where the like desire is inflamed for one who is ill-favored.
I love, because my love is not dependent on the object of love. My love is dependent on my state of being. So whether the other person changes, becomes different, friend turns into a foe, does not matter, because my love was never dependent on the other person. My love is my state of being. I simply love.
True love is mixed up with birdlike squabbles, in which the disputants wound each other to the quick; but a quarrel without animus is, on the contrary, apiece of flattery to the dupe's conceit.
Jealousy, you know, is usually not an affair of causes. It is much more-how shall I say?-fundamental than that. Based on the knowledge that one's love is not returned. And so one goes on waiting, watching, expecting...that the loved one will turn to someone else.