My hubby keeps talking about this girl that he knows, she posed for penthouse, should i be worried?

She is friends with his workmate. he says that she was stripping at this party he went to when I was six months pregnant! He says that he didn't watch her strip, but he knows it was her. Now he is setting up an engineering business, and he wants her to be his business partner, I am at my wits end. I feel like my life is one horrific car crash in slow motion and there is nothing I can do to stop it. He says that me and her are going to have to be friends, as his business is giong to involve her, but to tell you the truth, I want to kill her, because he just talks about her so much. If there is anyone out there who can give me some advice on how best to deal with this situation, I would be eternally grateful.