Aaron,
Here are a few options. If you provided me with the entire phrase, It would be easier to understand the context and provide you with a more precise translation.

Possible options:

From the heart: Du coeur
From the bottom of my heart: Du fond de mon coeur
You broke my heart: Tu m'as brisé le coeur (or) Tu as brisé mon coeur



Maz

Cajuns would say:

"t'as cassé mon coeur" for "broke my heart"

as opposed to standard French "briser"

Nicole