Like my friend A tell me privately he got a condo in overseas, will u tell friend B?
last time when i was young i also struggled to tell or not to tell u like u
when i grow older.. i learn to speak tactfully.. meaning... there's no hard and fast rules
i also protect my friend's benefits.. if the information say out is not good for my friend... i won't.
if it nothing trivial stuff... no problem
one way is to ask urself if you think you can tell your friend what you have just told others about him
if you feel you can't, then you know it's something you shouldn't share.