Try feeding again in about a week to a week and a half. They don't need to eat much, 2-4 crickets a week should do him fine, and you can feed them all in one sitting if it works for you and him.
That seems like quite a long time for an arthropod. I'm not sure when the last time he ate was - I forgot to ask the clerk at the reptile store. How long can they go without food?