Pour out/open your heart to somebody
Definition 1 of 1
Pro Tip 1/3Emotional Intimacy
Used when having a deep and honest conversation, usually with someone you trust. 
After the long journey, I finally opened my heart to my mentor.
Pro Tip 2/3Vulnerability
Signals a moment where someone exposes their vulnerabilities freely. 
She poured out her heart to me; it was clear she needed a friend.
Pro Tip 3/3Not Literal
It means sharing feelings, not literally the physical heart. 
He opened his heart to the audience, sharing his life's ups and downs.