"When one considers Greek love, it is, in accordance with its concept, essentially faithful, just because it is psychical; and it is some accidental factor in the particular individual that he loves many, and with regard to the many he loves, it is again accidental every time he loves a new one; when he is in love with one, he does not think of the next one. Don Juan, on the contrary, is a seducer from the ground up. His love is not psychical but sensuous, and sensuous love, in accordance with its concept, is not faithful, but absolutely faithless; it loves not one but all, that is to say, it seduces all. In exists only in the moment, but the moment, in terms of its concept, is the sum of moments, and so we have the seducer."
January 1, 1970
https://en.wikiquote.org/wiki/Fidelity