You are right, you are letting them into your head. You di have the right attitude though. Let it go, think of something else or go do something to get your mind off those thoughts.
So what if he is going camping. Maybe they will get poison ivy or something like that. Maybe the OW will hate it and will stink the whole time! Just trying to make you laugh.
Noone but God knows if your H has moved on. I think he is still in the crazy mode.
Maybe the OW will hate it and will stink the whole time! Just trying to make you laugh. 
