I don't agree with Amazon D. Don't do anything low or mean. Then, at least afterwards you can say, well, she may be a b&%$h but, at least
I didn't do anything low or mean.
When I got dumped a few years ago, I held a ceremony in which I wrote on little scraps of paper everything that had been a problem in the relationship, and all the crappy stuff she had done to me, and then I burned them all, one at a time, while chanting and smoking things.
Like, you could write, "sent mean texts about how she had sex with new partner," or "b*&%h blocked me on FB"--You know, stuff like that. Then, say a few powerful and magical words as you burn that so-and-so OUT of your life!
I'm sorry this happened to you, but maybe I should NOT have replied so soon after reading Aunty Cindy's Agony Column!?? Got me thinking a little wacky!

I do wish you good luck getting over this, though.