It's not really that I can't loan the $90... It's that the though of someone screwing me over makes me extremely uncomfortable. 
it's normal to not want to get screwed over.
hell, what if he doesn't pay? you're going to be payin more in lawyer fees than what he owes you.
there is no point if there is that much risk. or take his computer or PS3 for the time being until he pays you back