Discuss the relationship between Winston and Julia in Part1 and Part 2 in Orwell's work, 1984?

I think that the relationship between both Winston and
Julia represents the dichotomy between hopes and reality.  On one hand, the relationship
is depicted as one that represents a source of potential hope and redemption for both. 
It is a refuge from the numbing reality under Big Brother.  It is a realm that is
distinct from the control of The Party, and I think that both Winston and Julia
recognize a realm that is distinct from the public domain.  Yet, with the arrest of each
and the betrayal that follows, there is a brutal undercutting of dreams.  In the moment
of betrayal through the use of the other's deepest fears, the renouncing brings to light
that all are controlled by Big Brother.  When both see one another in the park with the
numbing admittance that both betrayed the other, the reality that confronts them and all
of the citizens of Oceania is that there is no relief, no absolution from Big Brother. 
This is where hopes and promises are undercut by reality and control.  In this vision,
personal redemption comes second to public domination.