Breaking a year lease by tenant and not returning security deposit by landlord
I live in Florida and I had to breake my 1 year lease after 8 months and gave a 1 month notice to my landlord. I found another tenant to rent the property after my moving out and the landlord promised me to return the security deposit. After I found myself the new tenant for the landlord and cleaned the unit, the landlord informed me he will not return the security deposit as I broke the lease and he is entitled to keep the deposit as a damage he suffered from it.
Who is right who is wrong?
I would like to sue my landlord to get my money back as he has suffered no damage as a new tenant is renting the unit the very next day I left the property and the place was cleaned.
Thank you in advance for your answers,
One unhappy floridian renter !:(