He’s not ungrateful to see the masterpieces of Michelangelo. It’s just that his personality is primarily dopaminergic: he enjoys anticipation and planning more than doing. Lovers experience the same disconnect between anticipation and experience. The early part, passionate love, is dopaminergic—exhilarating, idealized, curious, future looking. The later part, companionate love, is H&N focused—satisfying, peaceful, and experienced through bodily senses and emotions.