He wanted Natsu to remember his promise to the towns people in the silent town he made years ago, because daphane casted a magic on the towns people and made they disappear because the towns people didn't believe that Daphane saw a real dragon. So ya. Basically it's just that Natsu saw the heard the town people talking and promised that he will return them back to normal, but when he woke up he thought that it was a dream so he just shrugged it off. And when Natsu promised the towns people Gray was behind a house that was close enough to hear them.
he made daphene Trust him that he will kill natsu but he tricked both of them
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In different words, he explained that he knows that Natsu is the only one who could have defeated Daphne. So basically it was a ploy to get Natsu to defeat the fake dragon.