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Gatsby wants to be alone with Daisy. This is what he has always wanted. The parties were only so Gatsby could get nearer to her. Gatsby even replaces his servants so they will be more discreet.
He stops giving his parties because Daisy didn't like the parties. According to Nick, Daisy feels offended with these parties. Since Gatsby doesn't Daisy to be offended he stopped them all. The parties were all of Daisy so if Daisy didn't like them, he would stop them.