You should retain a business litigation attorney. First you need to get to the bottom of what he has been up to, via an attorney and maybe the threat of litigation. After that based on this info it sounds like you may have a good case against him. Feel free to contact our office - we actively practice in both Florida and New York. firstname.lastname@example.org.
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I agree with Mr. Criscione - you need a business litigator.
The above is general legal and business analysis. It is not "legal advise" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Collecting evidence could be very useful as you know your business. However, I concur with my colleagues. You need to to contact and hire another attorney.
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I am not sure where jurisdiction would be given the facts you have provided, but I would contact Brendan McQuaid with Ferguson, Skipper in Sarasota. (941)957-1900.