Roommate security deposit dispute
I am in the state of Georgia and I recently decided not to resign my lease with my roommate because she had her boyfriend living there the whole summer. The leasing consultant had us sign a roommate release which she explained was a form that would state that I wouldn't reside in the apartment anymore. She informed us that my security would be refunded by my roommate once she either moves our or find another roommate. She has since found anouther roommate and refuses to refund my share of the security deposit.
I must note that I did not terminate my lease and couldn't understand why a roommate release form needed to be signed. Also, since my father cosigned for me and is also on the lease, does he have any legal rights to half of the security deposit?