Give your heart to somebody
Definition 1 of 2
Pro Tip 1/3Emotional Depth
Reflects a deep emotional bond, suggesting vulnerability and significant affection. 
After years of friendship, he decided to give his heart to her.
Pro Tip 2/3Metaphorical Giving
Not literal; means to commit emotionally, not giving an actual heart. 
When Lana sings, it feels like she gives her heart to the audience.
Pro Tip 3/3Romantic Context
Primarily used in romantic relationships, often signifying the start of one. 
At the wedding, the couple vowed to give their hearts to each other forever.