Yes she does... she can file a divorce against her husband who sounds like a pathetic example of a human being. He cheated on her and was gaslighting his mistress and he refuses to say he is sorry because he will never apologize to anyone? And he has a badge? Good grief. May the former mistress go to his command with his behavior and hopefully he gets suspended or fired.I recommend you stop junk mail and catalogs from coming to your home.
Then you should take a long hard look at your relationship.
You have no legal action to pursue against anyone, based on what you have stated so far.