My question involves landlord-tenant law in the State of: Florida
Brace Yourself, It's going to be a long ride:
So my former best friend and I signed a lease together in 2012. Her aunt gave me money to cover her share of the security deposit but my friend was responsible for the 2nd month rent. Long story short, she was irresponsible with her money and I could see she would not have her share of half the rent for the 2nd month - Tension arise and we got into a physical altercation. I apologized for my part the next morning and she moved out. She took a restraining order out on me (I'm not sure why because I didn't try to contact her after she left) but did not show up to court so the case was dropped. She later messaged me and told me the order was only so she would have no responsibility in paying rent. I got another roommate for about 2 or 3 months but he ended up leaving to care for his terminally ill mother so I carried the rent on my own until about 3 months before the lease would end - The bills got to be too much and eventually I was evicted from the apartment - I didn't think to go to the eviction hearing the apt put on my door and explain my situation to a judge - I was young and naive and didn't know that a judge may grant me time to pay my rent based off of my situation. As I was collecting my things from the apartment, I told the leasing manager to send me any fees associated with my early departure and I would get them paid - I also provided her with a forwarding address. I never received anything from her and now collections is trying to collect:
The balance that holds both my name and my former roommate is $3800. I guess she was attempting to get her credit cleared because she got ahold of me to work out paying off the balance - I negotiated with the collections office to pay a smaller debt of $2684.52 in which I would pay $1600 and she would pay $1084.52 all by March. I have the transcripts from the creditor for the agreement and I have the text messages between her and I agreeing to pay the balance and for how much and at what time. Again, I paid my portion in once shot and she advised she could not pay due to car insurance bill - In order to keep the deal with the creditor for the lower amount, I offered to cover her portion and have her reimburse me. I even allowed her to come up with the timeframe and increments of which she paid me back - I paid $842.52 of her $1084.52 and sent her the payment plan to be signed and notarized - After deciding she did no longer wanted to pay the increments she came up with, she decided to she no longer wanted to reimburse me - Since the originally deal with the creditor was to be paid by the end of April and the balance of $200 still remained, the balance has now reverted back to the original $3800 in which she advised she will just pay them directly. She believes since we got into a fight, she is not responsible for the rent she left me stuck with.
My question is can I sue her for the months that I did pay up to losing the apartment, not the 2-3 when I obtained a roommate? My 2nd question is since I have the text of us agreeing the pay the creditor a certain amount and again had to pay her part, can I sue her for the $842.52 that I paid on her behalf? She now lives in Atlanta which is where she moved after leaving the apartment so I'm sure she would have to return to FL for the court case but I want to make sure I'm going into something with a strong foundation.
Thanks for any and all help.

