This question will never be answered and accepted by everyone. It depends on what you believe and what you perceive life as.
hopes this helps,
Xeno
Their relationship is forbidden. They are both members of a political party that is full of lies. Winston's job is to deliver good news to everyone despite the truth. There are telescreens around that may see their acts. It is an order by the government that promiscuity is not allowed between party members.