I'm so sorry for your troubles.
To be honest, aromatherapy will not be your most powerful aid in dealing with powerful heartbreak.
Hawthorne tea and Hawthorne vegetable glycerin extract (Gaia Herbs glycerin capsules are the best I've found -- you can order it online) are the most powerful and deeply spiritual herbs known for this condition, which by the way can cause real damage to the physical heart, emanating from the spiritual/emotional heart. I cannot describe how powerful and beneficial this herb is...you will have to experience it for yourself.
If you also require a scent, I would find a cream or an oil that is infused with rose and hawthorne (may flower), along with whatever else soothes you.
Peace & blessings
7L
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Bound by conventions, people tend to reach for what is easy.
Here we must be unafraid of what is difficult.
For all living beings in nature must unfold in their particular way
and become themselves despite all opposition.
-- Rainer Maria Rilke