My question involves landlord-tenant law in the State of: new york

I own a house he is supposed to be in charge of managing it. We are away for a while but plan to live back there in a few months.
He got involved with a risky business lady, for a few months now - she never paid rent and does not receive mail there. they were in a relationship,
Dont want to give out too many details. but they broke up and now he cant stay at the house for his own safety. She has run ins with the law and a violent history.
Hes now staying on a friends couch! she was spoken too and asked to leave as soon as possible, same day if possible and she did agree to do so. However i dont trust her
also did i handle this all wrong? i was extremely emotional during the call