In 1984, Winston experiences a certain conflict of emotions when Julia engineers a meeting with him. Why are they problematic for his status as a hero?

This section of the
novel occurs at the very beginning of Part II, whendeliberately trips up in front ofin order to
be able to hand him a note. Consider how Winston responds when he sees Julia trip and hurt
herself:

A curious emotion stirred in Winston's heart. In
front of him was an enemy who was trying to kill him: in front of him, also, was a human
creature, perhaps in pain and with a broken bone. Already he had instinctively started forward
to help her. In the moment when he had seen her fall on the bandaged arm, it had been as though
he felt the pain...