@Jessica L keen
Sorry for the late reply. I'm not on Biggerpockets as much as I was in the past.
So your fiance still owns the property. I would get a title search to see what liens are still attached to the property. You can also search the county auditor and treasurer's site to see if the taxes are being paid or if they are delinquent. Another search that can be performed easily is searching the county clerk of courts website to see if there are any pending foreclosures against your fiance. Once you have this information you can formulate a plan.
Assuming the bank abandoned the property and stopped paying the taxes you can proceed with filing a quiet title action to get the lien released if they haven't already released it. At any point in the process, you can file an eviction to remove the squatters. The property is yours to secure and use if necessary. Please use an attorney if you plan to file a quiet title action or eviction. Good luck to you.
Paul Amegatcher