User blog comment:Crazylittlefreakgirl/Fairy Tail Official Pairings?/@comment-288216-20120518001600

The only pairing that you can consider cannon is Jellal and Erza. From last chapter, maybe Gray and Juvia will be one too (although we don't know anything from his side since he didn't reply Erza's questions). The rest is just fans' speculation, even if some pairings sound obvious.

Pairings are important for Mashima and even contribute for the history, as seem in Rave Master (who doesn't remember Musica, Reina and the Silver Ray?). So, he wouldn't leave such information just to the anime.