Even in landlord friendly Georgia, your "landlord" (boyfriends dad) can't do this...although it does happen. Frankly, it sounds like dad got tired of have a couple of freeloaders living in his place not paying rent or utilities. Thus, the question might be whether you were ever tenants or simply guests he got tired of carrying.
Best to focus on getting your things out of there and finding another place to live. Hopefully you've saved enough money in the five months you've been able to live rent free to put a deposit down on your own place.
Gail

