Some Idioms

Aching heart

- a feeling of sadness that one has when love has been lost or has faded

The young woman spent the weekend alone with her aching heart.
After one`s own heart

- to be well-liked for agreeing with one`s own feelings/interests/ideas

My new boss loves to go fishing. He is a man after my own heart.
At heart

- basically, essentially, what one really is rather than what one seems to be

The man seems to be angry all the time but actually he is a very gentle person at heart.
Bleeding heart

- someone who feels too much sympathy for people such as poor people or criminals etc.

The man is a bleeding heart and he is always asked by other people for money to help others.
Break (someone`s) heart

- to make someone feel sad or hopeless (usually from love or a similar loss)

It broke my heart to see the boy who had just lost his dog.
Close/near to (someone's) heart

- an idea or something that is important to you and that you care about

The plan to improve the downtown area was very close to the mayor's heart.
Cross one`s heart and hope to die

- to say or promise that what you have said is true (often used by children)

"I promise that I will meet you tomorrow. Cross my heart and hope to die."
Die of a broken heart

- to die of emotional distress, to suffer from emotional distress (from a failed romance)

The man almost died of a broken heart several times when he was a teenager.
Do (someone's) heart good

- to make someone feel good, to make someone healthy

It does one's heart good to get a reasonable amount of exercise every day.