Well, to be perfectly honest, I have noone to blame for getting into the situation but me. Worse than that, I knew that one day it may actually come to this.
Ah, well - live and learn, right?
I don't have the total amount of money he owes me in writing. However, it is in fact a tenant of mine - and I do have a lease signed, so worse case scenario I should be able to get all the back rent that he owes me.
I have kept an excel spreadsheet of any money borrowed from me and what it was for - as well as when it was borrowed, but I have nothing else other than the lease signed by him. I hope to change that soon, though
Thanks for the help guys