confidante
/kɒn.fɪˈdɑːnt/; /kɒn.fiˈdɑːnt/Definitions
1. noun
a person, especially a woman, with whom one shares a secret or a confidence
“Her close friend had become her confidante and helped her through the difficult time.”
2. noun
a person in whom trust or confidence is placed
“He confided in his therapist, who became his trusted confidante.”