Falling in Love (Marcel Proust)

But, now that he was in love with Odette, all this was changed;

to share her sympathies, to strive to be one with her in spirit was a task so attractive that he tried to find satisfaction in the things that she liked, and did not find a pleasure, not only in copying her habits but in adopting her opinions, which was all the deeper because, as those habits and opinions sprang from no roots in her intelligence, they suggested to him nothing except that love, for the sake of which he had preferred them to his own.

If he went again to Serge Panine, if he looked for opportunities of going to watch Olivier Metra conducting, it was for the pleasure of initiated into every one of the ideas in Odettes mind, of feeling that he had an equal share in all her tastes.

Marcel Proust, 'Swann's Way'
https://www.amazon.com/dp/067003245X/ref=cm_sw_r_tw_dp_x_Oy2gAbN37Y7JK