倾国倾城只爱他风流倜傥只娶她
[qīng guó qīng chéng zhĭ ài tā fēng liú tì tăng zhĭ qŭ tā]
Literally meaning 'A beauty can topple nations; he loves only her, handsome and debonair, taking only her as wife', this implies exclusive devotion despite great charm. This conveys an intense yet idealistic romantic sentiment.