What can I do if my Bosses boyfriend is manipulative, rude, betrayed our trust, toxic, narcissistic and so much more?

Okay so the last time my boss saw her boyfriend was December 2024 when we went on cruise. Said he is a doctor and has been giving advice on what is best for her father my client. He had to much time to constantly text and talk on phone, renovating a property in Florida. Looked him up through license medical board of examiners in the two states he claims to be licensed MD nothing on file! He sent me a group text to say stop talking shit about him he has more money than I ever will have. Meanwhile is living in my bosses property rent free, not paying any utilities. What can I do to teach him a lesson? This guy is evil and boss is to deep in relationship she does nothing. Never met his family / friends after dating 4 years. Their support to move in together in a house he said he’s buying and his parents are planning on staying in the property he just renovated that she owns.

What can I do if my Bosses boyfriend is manipulative, rude, betrayed our trust, toxic, narcissistic and so much more?
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