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I am very sorry to learn of this situation.
Unfortunately there is no cause of action related to you quitting your job and relocating to another state to be with your fiance.
However, you can sue her in small claims court (where she resides) for breach of contract (the money she owes you), and "conversion" (the civil equivalent of theft) to get your property back.
Short of filing a lawsuit, you can try to mediate the dispute with them - contact your local bar association and request referrals to mediators, a third party neutral can often help you reach a mutually agreeable resolution. Use the bar association's referrals to contact a mediator or two, the mediator will then contact the other party to set up a mediation session, and you can go from there - hopefully resulting in a formal or written settlement agreement, and save yourself the time and expense of litigation.