Next chapter will be hayate thinking how to clear the misunderstanding, only to realize in the end that he has fallen for Nagi. Now that Athena is out of the picture I can't think of any other girl that has a chance of winning.
I'm interested in how Maria's role will play in the final arc. She looks like she still has heaps of secret yet to be revealed. She probably will be the key to clear the misunderstanding.
Telling Nagi the truth about their first meeting would open the path to the Garden,but it would destroy the relationship with Nagi that Hayate is trying to preserve by saving her inheritance