Originally Posted by
Mountainmanbob 
Dark secrets
one of the things that one's in AA share with their Sponsors. Confess your sins to God and another human being. For me, it was a big relief to share with another these character defects which I had hidden deep for a very long time.
A Sponsor is one that will take all shared with them to their grave.
MM
I wouldn't bet my life on that. Sponsors are human. AA members are not sworn to keep a confidence, and some of them are not so healthy.
Some things would be better shared with a professional who 1.) Doesn't know you in outside life, and who 2.) Is professionally sworn to keep confidences - such as a therapist or clergy. I'm not just talking about things that were illegal, but also things that are sensitive enough to cause emotional pain should they become common knowledge in an AA group.
I would not trust some things to a sponsor. I found early on that some sponsors will use them against you.