I agree with your remark about loving your enemy as far as actions are concerned. But for me the cognitive basis is the trust in an unrestricted causality. 'I cannot hate him, because he must do what he does.' That means for me more Spinoza than the prophets.
I loved her. I still love her, though I curse her in my sleep, so nearly one are love and hate, the two most powerful and devasting emotions that control man, nations, life.
But that is how men are! Ungrateful and never satisfied. When you don't have them they hate you because you won't; and when you do have them they hate you again, for some other reason. Or for no reason at all, except that they are discontented children, and can't be satisfied whatever they get, let a woman do what she may.
Of four infernal rivers that disgorge/ Into the burning Lake their baleful streams;/Abhorred Styx the flood of deadly hate,/Sad Acheron of sorrow, black and deep;/Cocytus, nam'd of lamentation loud/ Heard on the rueful stream; fierce Phlegethon/ Whose waves of torrent fire inflame with rage./ Far off from these a slow and silent stream,/ Lethe the River of Oblivion rolls/ Her wat'ry Labyrinth whereof who drinks,/ Forthwith his former state and being forgets,/ Forgets both joy and grief, pleasure and pain.