I would stay in the master bedroom, but not make a big deal about it. Let her decide where she wants to sleep without any pressure from you. If she chooses to sleep in the same bed, don't even comment on it.

I would probably stay away from sarcasm or teasing for now; just keep your communication simple, direct, and positive. If she's hostile or testy then she's probably anticipating, or even looking to provoke, a reaction from you.

If you haven't read the article about emotional reactivity, now would be a good time:

http://ezinearticles.com/?How-to-Avoid-Emotional-Reactivity&id=1535847

Me: 44, Wife: 39
M: 17 years T: 20 years
Bomb on 08/25/09
1/13/10: MC started
1/28/10, 2/8/10: More bombs
8/28/10: Wife moved out
No talk of D, no movement

"Every day is another chance to get it right."