If you need to be emotionally detached from your current wife, get a divorce.
You're probably still hung up on the JW teaching of 'divorce without fornication = sin'.
It doesn't - sometimes marriages don't work out, and you just have to more on.
Talk about it with your wife - make it clear that in short order she'd be scripturally free to remarry , and that you have no intention of coming back to the org, and if she refuses to get a divorce you'll oppose her religion/whatever.
In most states, if both parties agree to a divorce, and the conditions of the divorce, there are just some forms to fill out and the whole thing is over (IE., no lawyer needs to get involved or anything, nice and cheap).
You could always try and file for divorce on various grounds to force the issue - but I don't get the feeling you want to do that.
Xander F
(Unseen Apostate Directorate of North America - Ohio order)A fanatic is one who, upon losing sight of his goals, redoubles his efforts.
--George Santayana