"How are your relationships with your exes now? Did you manage to stay on good terms?"
I tried to be 'Friends' with my x-wife (I left her and divorced her when i discovered her affair). Part of the "Lets stay friends' was driven by, I suspect was that she wanted to maintain her 'perfect' image and say to people..."I cheated, I was wrong, but look we are all good friends no harm done"
I really tried to go along with this, but I can't forgive her, her betrayal, lies, tearing our family apart and I realised that I don't want a person like this in my life anymore, friends don't do that other friends, let alone a partner or spouse.
I gradually realised the less time I see her the better, the less communication we have the better as far as I'm concerned, It's been a gradual process over the last 3 years of letting her go and moving on with my life. I told her all along that if she ever cheated it would be a deal breaker on my part and I followed that through. We have children together and communication is necessary for the kids sake, but if we didn't have children I would rather never see her again.
My advice, minimise contact and as others have said move on an live your life, you deserve better than what he did to you.