I'm very sorry.
I haven't replied since we still share a bedroom, but I'm willing to talk in general. For one thing, you shouldn't force yourself; if you find you simply cannot stay with a woman, that promise (however well-meaning) should be void. In the meantime, if sleeping in separate beds makes you happier or more comfortable, it's not only a good thing to do for yourself, but it may be a good thing for the *relationship* - it might leave you with more energy and ability to cope with the rest of the changes.
As Peregrine says, too, it's definitely a transition for loved ones as well. Not the same kind, precisely, but those of us who choose to accompany a trans person on their journey have our own challenges to face and transitions to make. I also had to spend time grieving and coming to terms with things, and that's not a failure; it may not make any logical sense, but there can be a genuine and pervasive sense of loss even if the "same person" is still there.
(We do have a three-bedroom house in which we share one room and each got our "own room"/office, but I don't think that's what you meant. On the other hand, I also know more than one cis couple who have slept apart for years or decades and are still happily married. It means only what YOU choose to have it mean, and don't let anyone - even your spouse - tell you what sort of statement you intend to make.)
