I think the perfect way to act at this point is to completely ignore the "petition" or whatever it is.
I completely ignored OM in W's case - except when W left kids with him, and allowed kids on a bed with him. Then I slammed the door shut HARD. But, once I got my point across, he ceased to exist.
It's a little different in my case that OM is sort of a 'buddy' - lives over an hour away, still married, hot wife, 3 annoying kids.
Still - I think he was a 'revenge' item for W, and I completely blew it off. W is being really odd about the filing - just ignore it.
You are in a good place emotionally - don't get nasty/angry, just "don't care".
