Argh Confused. This is indeed tough stuff.
What do you need to take care of yourself? What is the next right action?
For many of us, we had to get the heck-out-of-Dodge but there were usually steps we had to take to get there. Some of these steps were trying to make things work before giving up hope.
Let the guilt come; feel it; let it go and learn everything you can from it. (Unfortunately for me the emotion will come back multiple times for a long long time)