If she's unhappy why should you move out??? Gosh, let her do it. I really don't understand the idea of the person wanting to save the marriage leaving. If anything it just seems enabling. You are also putting yourself in a potentially weak position if this leads to divorce.
Does she, or can she, pay full rent/mortgage where you live now? If not, unless you don't mind paying for two places, I wouldn't move out.
Also, one more thing to consider, moving out can affect custody if this leads to divorce. (And don't expect any goodwill or rationality from your spouse if you get to that point. There's a chance she'll claim you moved out and "abandoned" your marriage and child).
There is no arriving, ever. It is all a continual becoming.
