Let me just say that your marriage was over a long time ago. So was mine and everyone else's that post here.
Whether you can build a new marriage or not is really up to you.
I can tell you that first you must save yourself. Cause you are no good to anyone else if you don't.
Whether you legally stay married or not, you will always be connected to your wife as she is the mother of your children and when you look at them you will see 50% of your wife and 50% of YOU.
So it behooves you to do the work if for no one else, your children, but really for YOU!
Stop searching for happiness and look at the person responsible for your happiness.