Ex bringing new boyfriend around without consultation, what to do?

Now listen, I’m not her keeper, and I am in her house as I actively work on getting out, but she’s now brought a boyfriend around the house. I found this out from my son today who described him to a T. Is it best to just keep my mouth shut until I can move out? Do I tell her this is a violation of the boundary she set which was to not bring new people around the kids until we meet them and to not bring people around the house until I moved out? Part of me wants to speak up, part of me is disappointed and wants to just pick up more shifts and work harder to get out of here to get a place for me and the kids.