* For a physical object: cassé(e) (masculine/feminine)
* For a promise or a rule: rompu(e) (masculine/feminine)
* For a relationship: brisé(e) (masculine/feminine)
* For a heart: brisé(e) (masculine/feminine)
Here are some examples:
* Le vase est cassé. (The vase is broken.)
* La promesse a été rompue. (The promise was broken.)
* Leur relation est brisée. (Their relationship is broken.)
* Son cœur est brisé. (His heart is broken.)
The best way to choose the correct word is to consider the specific context and what you are trying to convey.