I want to write a good reply to this lady.

So here I am attaching some ss. Here is the story I am f 29 was in a toxic relationship with this guy 30 from south delhi. Last year I found out about his other lover from J&K. While he was getting intimate with me, he was also talking to her for emotional support. When I discovered her, I took him to CCD and confronted him openly about this "pahadi" girl. He claimed she was just a friend he knew from UPSC preparation (both of them are IAS officers now in the garbage collection department in trash public service commision-- just kidding ). Their conversations included insults about me, calling me a "snake " mocking my state and its people as dumb, and even making derogatory comments about my parents. I read every single trashy thing they said about me at 2 a.m. After that, we had a huge fight and he ghosted me for 10 months. I eventually moved on and got busy with my life. I even received an offer for a Ph.D. from a government institute.(DTU) Out of excitement, I messaged him about it, and what happened next was shocking. He shared my message with his mother, and she texted me on WhatsApp, only to delete the message immediately. This incident disturbed me deeply, but I couldn’t discuss it with my family because my father was sick, and I was handling everything on my own. Now, I’m wondering what I should do. Should I just let this go or respond to his mother’s text? He is a manipulative person who has spoken badly about me in his circles, and I don’t care about his so-called "friend" anymore. But his mother is somewhat known to my parents, and I keep thinking what if my parents confronted him about his behavior toward me, would his mother accept it? Does being a rich brat give him the right to get away with everything sending me nudes, blackmailing me with them, ghosting me for months, and talking trash about me to others? I did so much for him, from spending money to making efforts to spend time together, yet none of it seems to have mattered. I am so done with him. I thought I had finally moved on and was happy focusing on my goals, but every time I think about his mother’s text, it triggers me all over again. And mujhe darr nahi lagta i am not hiding behind my parents. I need to write a very good reply to his mother's so called dhamkiya. suggest something?