At the beginning of the story, Winston Smith vehemently hates Julia and believes that she is a completely orthodox government spy. However, Winston's feelings immediately begin to change after she leaves him a note and they privately meet in the Golden Country, outside of the city.
Initially, Winston is only physically attracted to Julia and enjoys the idea of disobeying the totalitarian regime by privately being with her. However, the more time Winston spends with Julia, the more his feelings for her begin to grow. Winston eventually rents an apartment above Mr. Charrington's antique shop, where he and Julia frequently meet and carry on their private affair.
After Winston spends an extended period of time with Julia, he develops a strong emotional bond with her and realizes that he is in love with Julia after she agrees to join the Brotherhood with him. Winston then demonstrates his love by vowing to never betray Julia before the Thought Police eventually arrest both of them. Winston's love for Julia is rooted in loyalty and sacrifice. He recognizes that Julia significantly improves every aspect of his life and he can forget about the threatening government for brief moments when he is in her presence. The fact their love is forbidden also intensifies Winston's feelings for Julia. They are two lovers against the world and are willing to die in order to be together.