How does Winston's behavior change in 1984?

In the beginning, Winston just goes through the daily routine of work and home, ever aware of Big Brother's presence everywhere. While his job requires him to rewrite "reality" according to the Party, he tries to remember his past. In his dreams, he envisions a place where there's peace. He feels cut off from everyone since relationships aren't allowed. This is why he gets involved with Julia and becomes friends with O'Brien. Winston's secret individuality gets him into trouble in the end, however. He's tortured and brainwashed until he loses his desire for individuality and says he loves Big Brother. He becomes an alcoholic who is only a shell of what he used to be once he gives into Big Brother.