I don't believe you are detached at all. You are merely otherwise occupied most of the time.
Because you keep checking her temperature.
Instead of believing God has His hand over your sitch.
Knock it off.
You have ZERO show of faith going on here.
Print this out and never leave home without it my friend.
It's THAT good.
You still are putting way too much focus on her. She is doing this to herself. It looks to me like HER problem is two fold, and it's HERS. There is a way to move forward without totally moving on. I may be wrong but I get a sense you are keeping your eyes peeled for her crash, this will prolong your journey and bring nothing but pain and disapointment.
I don't know about you, but with me when I really struggle, it means I am resisting something that HAS to happen to move forward. It has nothing to do with your wife and everything to do with you. You still may have some work to do.
I see you are relying on your faith which is excellent. The one thing you must understand is very difficult, but yet so very simple.
God is good and all God does is good. You will never be able to fully connect with God as long as you hold on to and focus on what is negative. Fear, Anger, resentment, regret, whatever it is. When you hold on to this you prevent God from truly working in your life. It's kind of like your speaking in a language the God doesn't. The great thing is when you truly surrender yourself to him, he will take all of this away for you. Allowing you to connect. You have to let it all go. Including your wife.
Believe.... you can do this.
I don't really know you that well, but I'll bet you any amount of money your willing to wager, I can find twenty good things about YOU for you to focus on RIGHT NOW.
I may be off here, but I sense a few things that have been holding you back from the growth that MUST take place to allow the Lord to lead you out of this. You and your wife are on seperate journeys right now. All you need to focus on is making it through yours. For you and your children.