Until you can't anymore 
Seriously, re-read and think about what you just wrote. You are basically rationalizing his actions. You want to see your coins and you don't want to be someone who 'fell for a scam'. Both things are totally understandable. But you should really ponder whether it is the wise way to keep on believing in him and potentially lie to yourself.
Thing is, I don't know what happened here, and if it really is a scam or not. But as of now I don't see any reason to believe him any more.