I actually was abused by 2 exes and I still talk to both of them. One, because he is the father of my children, and he hasn't, as far as I can tell, mistreated them, so I feel he should be a part of their lives. The other, because he's working hard to reform himself since getting out of prison, and he admitted to everything he did and apologized.
I have very mixed feelings, because seeing both of them triggers me a bit, but I also have good conversations with both of them sometimes. I kind of hate them, but want to be friends, but can't look at them. It's a weird dynamic, and I'm not sure if it's healthy.