A friend had this advice to give me today. She said to get through this I have to harden my heart. I asked her how to do it - she said to think of all the bad times. But when I do, I feel hate for him. And he feels it when he sees me. I can't be the cordial neighbour with this hate in my heart.
I would say that's not the best of advice. That would only lead you to becoming bitter - and it will be a bitterness that will extend well past him.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.