Florida-Tenant broke lease and left 2 days later than stated

[Frank Johnson]

Hello,

I gave a tenant about 60 days notice that his lease will not be renewed. He said he would not pay his last month. I told him I will keep the deposit then. A couple of days later he asked if he could leave a month prior to his lease expiring and receive his deposit. I told him if he was out prior he may get the deposit back(after reading I now know this was not best practice lol). When he moved he was 2 days past the date he stated he would be out. I’m only keeping 2 days worth of rent from his deposit not including a small mess I had to clean. Do I have grounds to hold part of the deposit? And what should I have done and what should I do in the future to better protect my investment? Thank you all I advance.