Friendship with an ex after divorce. Possible, needed?

STBXW asked if we will be friends or at least talk to each other like friends if we're divorced which is very likely to happen.

I always thought that we will be in our lives no matter what since we became family, but now.. I don't know.

How is that even possible to talk to each other after all this shit that I've come through. Maybe we could talk sometimes, but to be friends? I think noboby wants to be a friend with a person who betrayed you, right?

But then I think that 'what if...'. What if there's still a chance to recover our relationship and if I stop communication it will not happen surely.