So the lesson here is to never tell anyone exact amount you hold. You can inform just one member like your parents or wife about this so that they can recover the funds in case anything happens to you but never tell this information to casual friends or distant relatives.
Regardless if it's crypto or not, there will always be a person that will do a sh*tty act like that and sometimes those persons are just within your circle of friends that supposedly, you won't expect to do such crap. "Money is money".
Besides, I don't see why we should tell others about how much we owned, whether it's crypto or fiat. It's not making sense to me and that alone is already enough reason why I shouldn't do that. I can share my experience like the one in the story but to tell the exact amount I've been putting up on crypto-trading or any related crypto-investment, there's no way I will tell that specific detail, especially my current holdings and profits.
Generally, just stay low-key as much as possible.
Is that story really true? What an unfortunate guy as he is surrounded by bullsh*t friends.