open heart to
open (one's) heart (to someone)
To share one's deepest or most intimate emotions, thoughts, or secrets. Samantha finally opened her heart to me last night about how grief-stricken she's been since her father passed away. My father was a cold man, and he never opened his heart to anyone.
open one's heart to someone or something
1. Fig. to tell all of one's private thoughts to someone. I didn't mean to open my heart to you. She opened her heart to the wrong magazine, and it published a scandalous story.
2. Fig. to become loving and solicitous toward someone; to donate money generously to someone or some cause. We opened our hearts to Fred, who was soliciting for a good cause. We hope you will all open your hearts to our plea.