Hi, is this your only thread? If yes, I read it and this is my take on your sitch:
Your wife got involved with this man and wanted out. I would take it for granted she had a PA. OM dropped her (would be interesting to know what he is, is he married, single etc etc, do you know, did I miss it?) and your wife was let down... Now she wants to be single AND have family time again. She wants it all. I wouldnt suggest going dark right now but I would suggest you dim things a lot.
She is not detached and you still have a chance. Women appreciate and admire strong decissive men. And this is your chance to be and act like one.
Focus on you and your kid, create new routines, work on your mood, your looks, get your humor back, invest in your R with your D, have strict and clear boundaries.
When she invites you to meet up, dont accept every invitation. Dont be rude but politely use an excuse. You dont call, you dont reply at her texts immediately, you dont use the chances you get to see/be with her. You really need to become attractive at this point. She needs to start wondering, she needs to start wanting to know what is going on. She needs to realise you may be leaving her. I would go so far when she asks, because she will, to tell her that you decided she was right:You are not good together but you can be friendly for your child. Fake it till you make it.
Your story isnt weird at all. I have read many similar ones the 3+ years I've been around. And I've seen many men getting their hopes up too soon only to be disappointed. Right now you are the fisherman, she needs to bite that bait for good BEFORE you pull her out. Be patient. Reaaaaalllly patient. Godo luck K