Listen to me here, buddy. I'm not saying you can't move to the basement. I'm asking you to wait a week, then make the decision. That's all.
If your moving to the basement is a sound decision, it is going to be sound 'now' and a week from now. I am asking you to give yourself time to be sure of your clarity. Part of what is getting both your W and you into trouble is impulsiveness. And while impulsiveness may feel good at the moment, its long term effects can come back to cause you an even bigger problem.
Remember. The objective here is to RESOLVE the issue(s). Not to create more. If tonight you feel better letting her go to bed first and you falling asleep on the couch, so be it. But don't remove your presence from the room. Don't make it a statement, "I'm leaving and I'm not coming back until you invite me (ie., get my way)."
Do you see? Let the notion "I can move to the basement anytime I want' be the power you need to stay in the bedroom. Sometimes, just knowing we have options to leave is the exact thing that can keep us right where we are.
Just wait a week, k? I know you are hurt and pissed as helll, and no one blames you. Fine. Be pissed. Be hurt. But stay in the bedroom.