If HD moves out, I think it could trigger those feelings and put her into super defense mode.
*Anything* HD does to impact the status quo will be met with a Defcon Level 1 response from MrsHD.
I don't think that HD should move straight to separation when he hasn't taken the preliminary steps toward establishing himself as a full-fledged, card-carrying, equal in the marriage.
He can take the steps to establish himself as an equal and see how she responds.