Frank, this process takes time. Time can be our best friend, or our worst enemy. You can either wallow in your sadness, or change who Frank is. I'm sorry I can't tell you how to do it. All I can do is offer my support, and provide testimony that it is possible. If you are a religious man, pray to God to help you let her go. Pray to God for her well being. And pray to God to let you move on. In time...
God Bless
That's what I'm doing right now. I only now really started.