Wow! OW sure do have a lot of nerve, don't they? Crazy!!! Well, that is exactly what I have been trying to do is work on forgiveness. Not necessarily forgiving the OW but forgiving my XH. In my case, the OW is crazy & I believe has some major mental problems, so in some ways I guess I feel sorry for her.
I think you did the right thing by telling that OW that you would never be able to talk to her, she did wrong & she will pay for it eventually.
I think this all will come back to haunt these OW, but with the OW my ex is with since she is a sociopath I'm not sure she will even know it.
I do hope & pray that my ex gets away from her before she damages him really bad, physically or mentally. And, I do hope & pray they do not get a child, children need more stablility & love than this woman knows how to give.