She's returning home for in house separation!

[Upwards]

I guess what I am asking is how do I live with her, in separate bedrooms.

I think the most important thing here is to realise that right now she isnt filling the role of "your wife" as she's chosen to check out of this role, therefore DONT treat her like your wife. Treat her like an aquaintance, be polite but that's as far as it goes.

I know everyone says 180 her, but what so I not go for a walk, do I not do things with her.

You shouldnt be 180 her, DB is for YOU first and foremost to get you into a place where regardless what happens in your marriage you will be happy.

Right now your her fall back guy - Personally I wouldn't be going for walks or to the gym with her, not at this stage. You should be living YOUR life, going out doing YOUR things & working on YOU instead of doing things that your wife asks and spending all of your time worrying about how to act around your wife.

There is a reason they say to "act as if" because at first your acting but quicker than you realise those actions become natural and you'll begin to find yourself moving forwards.