confide
v.v. to tell a secret to someone you trust. You use this when you want to share something private with a friend.
v. to reveal a secret or private information to someone in confidence. Transitive — requires a direct object and often a prepositional phrase indicating the recipient.
She decided to confide in her best friend about the problem.
He felt comfortable enough to confide in his lawyer about the financial difficulties he was facing.
The diplomat chose to confide in a trusted colleague rather than risk the information being leaked to the press during the sensitive negotiations.
From Middle Scots confide, confyde (“to put trust in”), from Latin confīdere (“to put trust in, have confidence in”), from con- (“together”) + fidēre (“to trust”). First attested in English use in the early 17th century. Doublet of faith and fidelity.