I know we haven't spoken in several months but I want you to know I miss you and I still love you.  I think about you and your family every day and I say a "prayer" for all of you every chance I get.
I know that things may never be the way they were and I understand.  That doesn't mean I don't wish we could just start where we left off (before I pissed you off). 
Words can't express the way I am feeling.  I am lonely and sad.  I know that things are going well for you right now and I wish I had something to do with it.  The way things look from the outside looking in you are happier and better off without me in your life. 
If this refers to you (and you will know if I am talking to you) please accept my apology and consider letting me back into your life (maybe just a little).