Dear Suzanne:

In some situations, such as in therapy or counseling, it may be helpful to be honest about one's sins if revealing them is pertinent to the treatment. And, in fact, without revealing oneself in counseling, the counselor may not be able to help. Nevertheless, one is not required to reveal sins even in counseling. A patient will have to make his choice. Getting the help he needs may involve revealing his sins. It is purely voluntary, however, and a patient can always choose not to cooperate or not to terminate counseling.

Your question, however, is whether or not one is obligated, must, have to, reveal his sins outside of the Confessional. The answer to that is "no". Whatever sins you confess in the Sacrament of Confession are heard only by the priest and by God. No one else. You are not required to reveal your sins to any other person -- it is exclusively between you, your Confessor, and God.

God Bless,
Bro. Ignatius Mary