Going to have to agree with LITB. She is already gone. I know that this is a scary part of your life - it was the scariest part of mine knowing that my wife and best friend isn't coming back. Scary as hell.
But now on are on your own path. Easier said than done, but you need to act like she never existed. Never.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.