She's Saying My Man Tired to Sleep With Her (long detailed) (edited)

So I'll start with some background first, my fiancé and I have been together for 3 years. we have both had a male mutual friend for the past 6 years. about 2 years ago our friend got in a relationship with a crazy woman and she got pregnant. they now have a son together who's just over a year old. Now our male friend has some issues, his has depression, anxiety, and he's a bit of an alcoholic and is a regular drug user. the crazy woman is a controlling, manipulative, liar. She tells stories. for example if she went to the mall with her son her story would be that she went to the store with her son and got into a verbal fight with another customer. she adds pieces for drama and flare. I can't say too much on that because I sorta do the same thing but it was a bit deeper and I believed the stories I told were true, I sought help and have moved past it. she hasn't. these two fight all the time, she's called the cops on him saying that he beat her, (I was there for that, he didn't touch her) cps has been called by her mother, she put a restraining order on him when he decided it was probably better to leave her, it's just been one hell of a year. so he moved out, moved in with a friend his wife and their kid. and the friend got him a very good job. so about a month ago he stopped showing up to work and never came home for about a week. everybody knew he went back to the crazy woman. on Facebook he created a new profile and sent every single person in our friend circle a friend request except for my fiancé. this was really weird because he and my fiancé were best friends and considered each other brothers. we had some drama with our wedding plans a few weeks ago and our friend said he wasn't going to be in the wedding as my fiancés best man or come to the wedding as a guest. at the time from our understand it was because we didn't want any kids there and he said his son was a must and that if he couldn't bring him and his SO he wasn't coming. the crazy woman was invited but for multiple reasons not related to this post we didn't was children at the wedding. so a few weeks go by and things are settled down but we've had no contact with our male friend. a few days ago however we were talking to another friend from the circle and he said that the reason our male friend was really mad at my fiancé and the real reason he's skipping out on the wedding was because the crazy woman is telling everyone that my fiancé tried to sleep with her! this was confirmed yesterday when I was talking to another friend. She said that the story that the crazy woman tells goes like this; She was mad at our male friend and my fiancé was mad at me so the two of them went to hang out. during which he put his arm around her and said that the two of them should have sex. she said no because he was with me. he said yeah but we're not married yet. she still said no and he left and came home. I know for a fact this didn't happen. 1) my fiancé hates her, always has, from day one. 2) he's never found her attractive 3) she has always made comments about sleeping with him or stealing him from me 4) what she says my fiancé said just doesn't sound like something he would say. I've known him for 5 years, we're best friends 5) the only time he has gone to see her in the past 4 months is one day for an hour to drop off some stuff that she and our male friend left at our house after hanging out. he was gone for 10 minutes, they lived 3 blocks away and he took the car. reason it took long is because she was fighting with our male friend and my fiancé had to wait for the yelling to stop for someone to answer the door. now I 100% believe him. I told him that if there was any truth to this he needed to tell me because I was going to confront her and I promised I wouldn't be mad. he told me there was no truth to this and after 3 years of being together, a baby due in October and a wedding in February with neither of us ever cheating on each other before who am I not to believe him. he then asked me not to confront her because it's just not worth it. I want to honor his wishes but I'm so pissed off. she's making shit up about my man that isn't true and telling everybody in our small town these lies. I don't know where to go from this so if you read this whole thing thank you and if you have any advice or words of encouragement that'd be great. I really cant talk to my fiancé about it because it just makes him upset that our male friend is no longer in our lives and all of our friends are listening to this bullshit.

(Edited)

I did it, I sent her a message because I'm not good at face-to-face conversations when I'm confronting somebody but we'll see how it goes