Example:
Hanna: Thank you for taking me to see the puppies.
Ceasar: I told you they were cute. I just didn’t think you would bring one home.
Hanna: Well, it broke my heart to leave such a cute puppy all alone in a cage. 
Ceasar: You’re breaking my heart with the thought of how much time we have to dedicate to this cute
animal.

Meaning: The expression “to break someone’s heart” means to cause or create pain and anguish on anyone on a deep emotional
level.  To make someone extremely sad.