It's very possible that either scenario's could happen, Hayate might go through it out of duty or for feeling responsible for whatever reason, It's happened plenty of times in the manga so far when he has felt like something was his fault etc. or as Chaos said Ruka wins and they are together for a time and something happens. (Who knows)
I think a lot of people are applauding Nagi's boldness to this issue of Ruka confessing to him.
But in saying that me personally would rather not see Nagi winning this competition for the shear fact its too(well to me anyways) Cliche that she wins(main heroine etc.). I just hope it turns out to be a good story either way!
