This is a commercial space correct? Do you have a lease? What does the cancellation clause say? Did you give written notice?
Assuming your short form explanation is correct ( there is two sides to every story) I think you will fair pretty well in court. He didn't lose anything. Unless of course the tenant who took your place pays less.
I go to court next month also. I own a commercial building with a partner he filed charges against me for stealing the mailbox.
