My Narcissistic Ex falsely claimed I physically assaulted her on social media (with backstory)

Using Alt account for obv reasons. Title says it all. I have screenshots, everything. She tells some people in private chat that I did infact do it, and to someone else she says it was a joke and must take it in humor. I was dreading for this moment since the breakup, I knew she would not let me off the hook so easily, I was sure she was crazy and delusional. There are marks on her hand, which she posted online today, they are of my mothers hands. The day we broke up, we got into a big fight (basically just her, while I was trying to get her to calm down), she got out of the car and strated running around on the side of the road in dead middle of the night. Thats when I had it, and called my parents to get me out of there before she could make the situation any worse. As my parents got there, my mom grabbed her arm as she tried to run away towards the highway and put her in her car. The marks are from that. She could have been hit by a truck and died that day, I still have scars from that. I blamed myself personally responsible for dragging her to this level, and finally managed to calm her down by involving families and got things under control. But, I am scared she will continue to use all of her energy to ruin my life in one way or the other even in the future. I know this sounds far-fetched and crazy, but I want to simply move on from it, we had some good times but mostly bad times, and its good that we found out early enough that we werent the right people for each other. However, I cannot simply go out in public with common friends trying to doubt me whether I am a physical abuser or not. It is fucking with my head so bad, I dont know what to do. I have been extremely nice to her parents, helped them out with things more than she ever did, and I know my boundaries very well when it comes to respecting women. I told my parents about it, and I did convey to her how I am absolutely pissed off through a common friend, so I hope it stops. But I highly doubt, as what I read about Narcissistic personalities online, I find they love taking things out of context, gaslighting and adding fuel to the fire. She has lied to her family and friends quite extensively, and I wouldnt be surprised if I find out she was lying to me about things as well. Today, I threatened to let her family know about a lot of shit that she did and talked about if she continued such erratic behavior, again through the same mutual friend, and somehow she took the entire conversation out of context only leaving the threat part and posted another story. I am dumbfounded by the level of anxiety and PTSD she is giving me and my family, and also making me act impulsively and basically me looking like a fool in the end. I dont know what I/we should do. Sorry for this long ass rant, please let me know if there is a better sub to get support and the right advice to how to handle such matters peacefully and respectfully, because I end up falling for the trap every single time.