I've definitely trusted a few people in my lifetime with confidences that they couldn't keep. Fortunately I'm at a point in my life where I have gotten fairly good at vetting people. About a year ago I ran into someone who I shared a little more information than I should have with, only to realize they weren't very trustworthy but fortunately I wasn't very close with them and not much damage was done.

As you get older you get better at seeing people for who they are faster.