<human>: Give me a shortened version of the text

I'm not even sure where to start with this, I'm so hurt and confused. Essentially, my SO's best friend's ex claimed he overheard me telling someone that I was going to sleep with my SO, and then sleep with her best friend as well. And he told them that. They are now convinced that I did say that, and I don't even know how to defend myself, because I don't know remember what we were talking about when he "overheard" that conversation.  

   I asked the guy to sit down and talk to me about this. My question is: "How do I convince him that he's wrong, and that saying that is so counter to my personality and so out of place from something I would say?" I really want to save my relationship with both my SO and her friends
<bot>: My SOn's best friends ex accused me of saying I'm going to sleep with both my SO and her friend, how do I convince him he's wrong?