Ex-wife lies to friends about her cheating

I don't know even know why I care - but it's been two and a half years since our breakup (and the discovery day) I have pretty much gotten over her cheating - I don't want her back, and although I still despise her and her new guy (an old friend of mine), I'm quite allright with being alone, and very happy about not being with a cheating liar. However, it recently came to my ear that she goes around telling people that she didn't cheat on me, that this is something I'm making up due to my illness (I'm diagnosed bipolar), which of course has led to a lot of people that I thought of as friends just cutting me out of their lives, and people that are still friends doubting that what she did ever even happened.

I should just let it go, of course, but it's just infuriating to me that she prances around lying even about this stuff. She can't own up to anything. She admitted cheating to my face (she admitted to having cheated with at least one guy 10 years before we got married, over a long period of time, and how she lied to my face to make that happen), and I know for a fact that it happened - her story adds up to certain events - but she now claims she didn't ever admit to anything because it supposedly didn't happen. After she admitted to the cheating, there was a long period of her lying and manipulating about so many things I lost count.

My blood is fucking boiling over this. I know for a fact that she is a cheating liar, but due to her charisma and seemingly friendly personality she's making me out to be some sort of jealous idiot she had to break it off with, because I was delusional. I wouldn't really care what she told other people, except now I know she goes around lying about me to make herself look better. It's like a double shit sandwich; not only did she lie to me for 10 years, hook up with a friend of mine six months after our wedding, admit to having cheated on me - then fucking blame me for all of it!

I'm rambling. I'm sorry. I should just let it go. Just in need of some support, I guess. Thank you for reading, if you came this far.