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I am sorry to hear about this situation. FL does not recognize common law marriage, so this is not a viable option. Furthermore, FL does not have palimony, so this is not an option either.
Therefore, the two parties would essentially be considered "roommates." There is no possibility for financial support unless he agrees to it.
If you have interest or hold a position in any company which he controls, then this may be used as a source of leverage and you can enforce rights as a shareholder, member, officer, or director or said companies. However aside from this, I am sorry to say that there are no real other options available.
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