Detachment IS a process and does not happen overnight. It is not emotionally based - "I'm mad as he!!, so I know I'll be able to detach."
Coach and Puppy hit the nail on the head. Nothing to add there but a "RIGHT."
One image/thought that helped me was this one. Sorry for the non-religious folks, but I think you can apply it as well.
I realized that it was not God's plan for me to be alone. So, either one of two things was going to happen. One, my W would "come back" and want to work on our M. My old M is dead, so we will work a new M in which we will both be happier than we ever thought possible,
Two, my W does not come back. In that case, it means God has someone out there who needs me more than my W. And, that person is someone with whom (not BECAUSE of whom) I find happiness like I haven't known before.
Either way I win. So, why worry about the outcome?