In one case I found out they lied to me about why we broke up and the second she became a horrible, vindictive person after we broke up and started spreading lies and rumours about 6 month after we split. Originally both breakups were quite amicable and soured and they didn't understand that that had quite a lot to do with my decision to 100% no contact.

I don't think I'm 100% against it now that I think about it further. I just seem to have a history of dating people with an underlying hurtful streak and/or poor empathy...