Morbo if you can't avoid going over there and have to interact with him then just be brief and courteous. You certainly don't have to be his buddy. If dropping off or picking up then don't go inside, just wait on the porch. That's how I was with OM the few times we crossed paths. I don't blame him or harbor ill will, but at the same time he was a contributing factor in the demise of my marriage so I don't particularly want to be chummy with him either.
