Bronwyn Newport’s new “mystery man” has been identified as a married restaurateur, Page Six can exclusively reveal. Over the weekend, the “Real Housewives of Salt Lake City” star — who has been spending much of her time in New York City — was photographed getting cozy with Café Mulberry co-owner Justin Sievers at the US Open. While Newport is single after separating from now-estranged husband Todd Bradley last year, Page Six can confirm that Sievers is still legally married to his wife of a decade, Maria Linn Ekenberger. Multiple sources claimed to us that Sievers and Ekenberger, both 42, were “not separated” when Deuxmoi obtained photos…