Board Thread:Questions and Answers/@comment-96.48.230.104-20150210084429/@comment-4755115-20160306204802

There is no reason to believe they will ever break up in the series. They've both gone through too much together and are far too dedicated to one another for it to be a possibility. On top of that, Reki has said in his author notes that he loves and respects the relationship between Asuna and Kirito and acknowledges that his fans feel the same way (Progressive Volume 1). So he wouldn't try to have Kirito leave Asuna for another woman.