Chopper chappie - you sound like an 'awfully nice chap', from all accounts, none more than trusting in your fellow colleagues to play ball when it comes to behaving themselves when it comes to sharing the chopper.
From my perspective - 13snoopy has it in one. Would you share your wife with anyone (don't answer that!) so why share the next thing which will kill you if you don't look after it!!!?
You either don't have much of a survival instinct or you are maybe a little green behind the ears??
I suspect he took off without the governor switched on.