Sorry you are here. I'm new to this as well, but my sitch started out similarly as far as short move outs to trying to live under one roof.
I will say that if I had it to do all over again, I would have done things completely differently when we were both at home. I didn't see it at the time, but I was not giving my W the space she truly needed. At first it was the puppy dog thing, then as I tried to stop talking about R and spend more time playing with the kids and helping out more around the house, she found this smothering. Always in the same room, always trying to small talk, etc. Things deteriorated very rapidly.
My advice would be to continue to give her tons of space and go about your life as you would. Do not try too hard to fix all of the things you know you need to. Try to keep conversations lighthearted as much as possible.
I wish I could go back to where you are now and do things differently.
Good luck, there are some really good people here to help you out.
