Winston believes that he is the only one who can remember certain events. He thinks that everyone else is dumber than him because he remembers things the government says aren't true.
When Winston is working at his job, Julia runs into him and drops a note. He thinks that he was found out by the "thought police" and believes he is going to get executed.
Winston and Julia meet and talk about meeting again. Their relationship is secret to everyone else, because they aren't in a relationship that corresponds to the rules of Big Brother.
Winston meets O'Brien, a member of the Brotherhood, who gives him a book about the rules of the Brotherhood and recruits him into the Brotherhood. Winston does not know that O'Brien is a spy of the Inner Party, and this is a trick to let Winston open up to O'Brien and tell him his secrets.
The Inner Party captures Winston and tortures him for moral degradation. Winston believes they are punishing him, when they really want him to feel like less of a human than he really is. O'Brien convinces him that everything he does is for the Party, and that he has a mental illness that makes him imagine situations or facts that do not exist.
Winston is "cured" of his illness (which is made up) and he now believes that everything the Party says is true. He does not love Julia anymore, and Julia does not love him anymore.