It's hard to tell what sort of problem you may have caused for yourself.
Charles did provide an essential piece of information, "Any person who performs the service of selling real estate for another and FOR A FEE must be licensed by New York State"
That applies in NY and FL and I'm sure in every other state that issues professional licenses.
Now, none of us know what you signed.
None of us know what your arrangement is.
None of us know your level of knowledge regarding buying and selling real estate and your knowledge of the role of an agent and broker.
And none of us know what is the real meaning of "he is still trying to hold me liable."
Just way too much we do not know.
You should consider calling one of the Brooklyn agents responding here and have them review the paperwork you have. They will be able to advise what the next step should be.
Don't click that "contact' button.
Don't use the email link.
If you are serious...and you really, really should be, pick up the phone and call.
Best of Success to You,
Annette Lawrence, Broker/Associate
Remax Realtec Group, Palm Harbor, FL
727.420.4041 - http://www.RealEstateMadeEZ.us
Few things end a friendship faster than introducing money.