Take somebody into your confidence
Definition 1 of 1
Pro Tip 1/3Trust Implied
Using this phrase suggests a strong level of trust towards the person you're speaking to. 
Before launching the project, I took my business partner into my confidence.
Pro Tip 2/3Secrets Shared
This phrase often refers to sharing information that's not meant to be public or widely known. 
I took Julie into my confidence and told her about the surprise party for Dean.
Pro Tip 3/3Choose Wisely
Be selective about who you 'take into your confidence' as it involves personal or delicate information. 
I only take my closest friends into my confidence about family matters.