1984 seems to be trying to be both a love story and a tale of rebellion. The posts above suggest the complexities that are offered in interpreting this novel in either way, and I agree with much of what has been posted.
The fact that the rebellion fails as well as the loyalty between the lovers, does not, to me, mean that the story's themes are compromised or that the book fails to be a "love story" or a "story of rebellion".
There are narrative flaws here that serve to erase or at least diminish the effectiveness of the love story involved in 1984, regardless of the potential centrality of this love to the text, and which also skew the narrative toward its ultimate political statement, compromising the story and characters in order to do so.
This is not a story, in the end, about people as individuals. It is a book about how politics influence society, looking at an extreme situation wherein rebellion is successful only insofar as it is acted upon with passion for a moment. When the moment is over, the system wins.