Is it legal to do this?

Soo long story short my grandma and I don’t talk anymore for ridiculous reasons but we rent from the same guy (we don’t live together) but he decided to tell her that I’m short on rent ($100) but I asked him not to tell her bc I don’t want her in my life anymore and she doesn’t need to know my business so my question is it legal for him to tell her that I’m short 100 or not? In the state of VA.