Yes.  I am going through this.  Letting him go is so difficult.  I have had many painful, hurtful relationships, this one I wanted it to work out so badly.  We were not married but I wanted to be married.  I really thought this one would work.  I look back and I made so many mistakes and decisions in the relationship and now he is gone and most likely with other women as I suspect.  It will be a long healing process.  I have had to seek medical help.  I hate to even admit this online.  It is so so so difficult.  I miss him terribly and I am doing everything I can to let it go.