I am just reading over the end of your thread and this may have been said before but your W seems to have serious insecurity issues. Which I'm not sure is your fault?? It's a constant pattern... she feels insecure so she lashes out at you. You are a strong man to be able to take so much constant negativity from her.
I say the move to TX would probably be ideal for the both of you because she may actually, for once, be able to focus on herself and get in a good place emotionally and psychologically. I don't know what it is about your R but the dynamic of it seems to bring out the worst in her (maybe the worst in you too?) Obviously your R wasn't always like this or I'm guessing you probably wouldn't have ever married her (IDK, that is a total assumption). I think letting her have her space and reflection time could be just what she needs. And it could be just what you need to clear your head too.
So many people are scared of separating because they think it's the start of the end but in actuality I think if you DB it just right, it could be the best thing that ever happened to your R. You learn a lot about yourself and what you really want and what truly needs to happen in order for the R to have a healthy life. I think you'll also find a lot of the answers to the questions that you're struggling with right now. Somehow things just start to get a lot clearer when you're not dealing with your S face-to-face ALL the time. Emotions are raw and can be very misleading.
Me: 32 H: 32 M 9 yrs #1 D7 #2 S5 #3 D2 Bomb 8/12/11 H moved out 8/14/11 PA started w/H & OW in 1/12 - found out 3/24/12 Got my own place 8/25/12 H & OW move in together 9/15/12 Still married.