He's just not ready for bugs yet, like I said, Imp took a month of feedings before he'd even look at a bug. He then ate really well from 4 months until 7 mo and now he's a year old and still being hand-fed bugs and greens. It's weird how they decide if they'll eat or not. Have you thought of getting different bugs than crickets? If you live in the States, you can get small super worms, Imp loved those for awhile. What he eats mainly is roaches. They're so good for dragons, better than crickets, easy to raise and take care of (I have 2 colonies, 1 in a 10 gallon tank and 1 in a 20 gallon tank. I have food enough for all my dragons, I just buy super worms.)
But don't get down about the non eating part. You'd be amazed that in a while he'll be eating bugs like crazy. I'm so glad he's so active, means he's doing well with what you're giving him!