Who must Winston betray to be truly cured? Does he do it? Why?

Winston must truly betray Julia. Winston is in room 101 and his face is in the rat cage. Winston is terrified and searches for the one thing that can stop the rats from eating his face. He does not hesitate to substitute Julia for himself. The rat cage is too much for Winston the bare. He proves O'Brien's point that love and loyalty have limits. There is only one love and loyalty that is real: love and loyalty to the party.