At the end of 1984, what "victory over himself" does Winston realize he has won?

To understand
whatmeans by this phrase, take a look at the line which follows:

He loved Big Brother.

In other words, Winston no
longer thinks of rebellion; he is no longer concerned with bringing down the Party. His
experiences in the Ministry of Love, particularly in Room 101, have successfully moulded him
into an obedient Party member. His sense of individualism and his desire for free thought which
dominated the previous chapters of the novelhave disappeared. 

This is,
perhaps, not the ending that the reader might have expected, but it is significant because it
demonstrates the power of Big Brother and, more importantly, how the processes of torture and
brainwashing can erode any personal loyalty, like the loyalty between Winston and
.