How does Winston change in 1984 from chapter 3 to 4 of book 3?

In Book 3, Chapter 3 of "1984," Winston undergoes a significant transformation as he experiences the depths of betrayal and loss of hope. Initially, he clings to memories of love and resistance, but as he endures brutal torture and psychological manipulation in Room 101, he is ultimately broken and betrays Julia. By Chapter 4, Winston has lost his rebellious spirit and is completely subservient to the Party, demonstrating the devastating effects of totalitarian control on individual will and identity. His acceptance of Party doctrine reflects a profound internalization of oppression, marking his complete transformation from a defiant individual to a compliant follower.