Broker suing over non payment of fee

I responded to an ad on streeteasy.com to share a potential apartment with an existing tenant as a roommate . The ad did not mention a broker's fee. Also I never signed any agreement with the broker nor was I provided with an agency disclosure statement. The broker did not even show me the apartment; he merely provided me with the building address, unit and tenant's name. In addition, the building... [more]

I responded to an ad on streeteasy.com to share a potential apartment with an existing tenant as a roommate . The ad did not mention a broker's fee. Also I never signed any agreement with the broker nor was I provided with an agency disclosure statement. The broker did not even show me the apartment; he merely provided me with the building address, unit and tenant's name. In addition, the building is a no fee building and I was advised by property management that it is inappropriate for this broker to charge a fee. Subsequent to agreeing with my roommate to move in, the broker then notified that I owed him one month's broker fee. I was never named on the lease nor registered with property management as a co-tenant/occupant. After living there for 3.5 months I moved out and received a notice that the broker is suing me for non-payment of the broker fee. Is he legally entitled to a fee? Any help would be much appreciated! [less]