I don't know your sitch but after my ex divorced me and I saw him, he looked like he was on the brink of having a breakdown. I haven't seen him in two years now but can't say I ever dreamed about him.
Although we will never know what is going on in their minds, sometimes I think that they have moments of guilt and sadness about the loss of us I think its normal to want them to suffer after what they have done. I still love my ex h but I hope he is unhappy and has a hard time when he thinks of me.