This is why I never used a real name
No matter how secure - it's never fully secure
AND ... just as an example ...
I've told things to friends I never expected to be shared with mutual friends.
It's not a lack of trust it's just other friends have their own friends I don't like/trust. Before I've known what's happened everyone knows stuff I told to one person.
ALSO ... the stuff I've been able to discover about people is surprising