.." and he went on to say if i had acted even half this way before maybe we wouldnt be in this mess"
He is noticing your positive changes but is trying to make the current situation all your fault. My WW said almost the exact same thing. So just make sure the changes are permanent.
I think it would be a good idea to have someone you trust come to the house before he gets there so you can leave prior tohis arrival.
Please stop worrying about OW. I am sure its not the perfect relationship you think it is.
M 55. W 43 T 12. M 8 1st BD 9\16 W moved out 11\16 Recon moved back 2/17 2nd BD 8/12/18