Unlike most other states in the U.S., Florida does not require a landlord to mitigate damages. So if you have to leave your rental before the lease is up, they can hold you responsible for all future rent payments. They have no responsibility to re-rent the unit after you leave.
Another option is to find a subletter to take your place for the remainder of the lease. According to Florida law, a landlord cannot unreasonably refuse the tenant you offer as your replacement.
The information provided on this website does not, and is not intended to, constitute legal advice.