Claim: In Spring in Fialta written by Vladimir Nadokov born in 1899, Nina is attractive and had multiple affairs while Victor lacks the conviction of true love
Evidence: "Spring in Fialta" is a short story written by Vladimir Nabokov in 1936, originally as Весна в Фиальте (Vesna v Fial'te) in Russian, during his exile in Berlin. Victor, the narrator, serendipitously encounters Nina, a fellow exile, at Fialta, a fictional Mediterranean town. Nina is attractive, seemingly aloof, and ephemeral. Victor, on the other hand, though still feeling deep affection for her, lacks the conviction of true love. He has remained faithful in his own marriage, while she has had multiple affairs that have gone ignored by her husband, Ferdinand, beyond his using them for business connections. 
Vladimir Vladimirovich Nabokov (Russian: Владимир Владимирович Набоков [vlɐˈdʲimʲɪr vlɐˈdʲimʲɪrəvʲɪtɕ nɐˈbokəf (listen); 22 April O.S. 10 April] 1899 – 2 July 1977), also known by the pen name Vladimir Sirin (Владимир Сирин), was a Russian-American novelist, poet, translator and entomologist. Vladimir Vladimirovich Nabokov
22 April O.S. 10 April] 1899
Saint Petersburg, Russian Empire Novelist, professor