Well you need to figure out why he cheated instead of going rabid on the mistress like it was her fault. HE is your husband who married you and made promises, not her. Unless she tied him to a title and twisted his arm, to place the blame on her is unfair and it wont get you your husband back. It takes two to tango. I never understood why in cheating and adultery cases women are always the ones demonized. People dont call men homewreckers after all, only women. As if men dont cheat or as if the woman did some spell on the man or worked her evil witch magic. It is all very misogynistic. Anyway no I would not call her out, leave her alone, your husband cheated on you, not her. She is nothing to you, you are nothing to her. I would call him out. Figure out why he cheated and then go from there. Yelling at the mistress wont change a thing and only drive him into her arms even more.