Notice how the corner store bags of jerky all have those little packs of "you'll die if you eat me" crap in them? And that stuff isn't nearly as fresh as what we're buying.

Though I probably should have been more adamant about the fact that this stuff should be kept in the fridge, so I'm sorry for that.

Mike the stuff at the store also doesn't have fat, I did a lot of reading on making Jerky before I found this guy. It is the fat that makes the Jerky go moldy because it holds moisture.
The fridge definitely helps though, I was at around the 2 week mark when I started seeing mold without the fridge, with the fridge it goes for a much longer time.
Also definitely keep it vacuumed sealed until you are ready to eat, that should help a lot too.