It's not so much that he can't fall in love, but he has not the weakness necessary.
Leo Tolstoy (2016). “The Complete Novels of Leo Tolstoy in One Premium Edition (World Classics Series): Anna Karenina, War and Peace, Resurrection, Childhood, Boyhood, Youth, The Cossacks, The Death of Ivan Ilyich... (Including Biographies of the Author)”, p.1610, e-artnow