How is Winston and Julia's relationship a rebellion against the Party in 1984?

Their relationship is a form of "ownlife" which is antithetical to the party's ideal of a collective. Because they become emotionally attatched to each other it becomes concievable that they will put individual desires ahead of state needs. This is at the very heart of what unorthodoxy means, and is the reason for loveless marriage and "artsem". Thus, because their relationship is built on mutual attraction, sexuality, and personal consideration they are underming the heart of Engsoc. There is, however, a difference in the form rebellion takes with Winston and Julia.