I always get spam bearing such sentence on the subject line. But when I checked the dictionary the word ' heartburn ' doesn't seem to be what I used to think it means. It is about real chest pain. From my understanding, it is normally used in a romantic relationship where either side gets a heartburn from a break-up. Is that the case ?
I believe heartburn is the feeling you get from stomach acid.

...or indigestion. I think what you meant is a broken heart.

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I agree with NanakixIII.
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