how does law value "right of surviorship" joint tenants with equal initial investment, non married, w/ one side paying the majority of the cost.

The question

1)12 year relationship- non married 2) live in 2 states, I own separate properties in NC 3) own jointly (2) properties in Florida with full rights of survivorship Purchased 7/1/19 and 5/20/16 4) the property value has doubled 5) my name is on the note for (1) and on the General Warranty Deed for both 6) we want to separate our assests however I dont know how law determines the value of my investment.