If they are fertile, just wait, if it's his time, he will hatch.
Have you tried candling it? Just to see if the egg is truly fertile? We have had eggs laying for a long time when we just started, and they never molded or anything, but in the end they were just not fertile...
If you don't know how to candle them, here is a great explanation.
Candling Eggs - Gecko Resource Forums
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