While it’s not totally clear who else he has hooked up with in the Vanderpump Rules universe, it wouldn’t be surprising if it was another server from TomTom or SUR who isn’t a main cast member. Despite Max saying he doesn’t love the idea of his employees talking about or asking him about his personal dating life, he sure does enough in-house flirting and hooking up to make himself a target of gossip.
So far, Max has been linked to Dayna, Scheana, Valissa, Adriana, and Karrah, who have all made appearances on the show in some way. Max claims that he would basically prefer to keep his professional and private life separate, but for all that talk, he seems to date or hookup with women on the show more often than not. Because of that, it’s more than likely that whoever else he slept with came from one of the restaurants on the show.
Source : https://www.distractify.com/p/who-did-max-sleep-with-vanderpump-rules