confidant
In Italian, 'confidente' is used similarly to English 'confidant', it refers to a person with whom one shares personal matters or secrets. It is often used in the context of a close, trusted friendship or relationship.
My best friend is my most trusted confidant.
This sentence is using 'confidente' to describe a person, specifically a best friend, who can be trusted with secrets.
You are my confidant, I will tell you everything.
In this instance, 'confidente' is used to address the person directly, indicating that the speaker trusts them with their secrets.
A confidant is like a living diary.
Here, 'confidente' is used in a simile to compare a confidant to a diary, implying that a confidant is someone you can share all your thoughts and secrets with, just like a diary.