That tactic was how one of my guildmates lost his Dread set a long time ago. :| And I was tipped off that LazyFish is a scammer by someone too, so... Good riddance.
A guildmate/friend or not, you're not required to let them borrow anything. If they wanna play the 'woe is me'/'wat me a thief nevar'/'you a horribad guild leader' game, then that's indication that they're probably up to no good. :|
@TinyLegs, that sorta thing can happen to anyone in any game in any server. :| Jewelia probably has their fair share as well.