a letter to write

If, after a long nc, due to my own stupid complicated mistakes, there's only 1 chance to write 1 letter to her, what should I write? Should I appologize and beg for a last chance? Should I leave the relationship with head held high? Should I explain away all my complicated mistakes I made? .

Beg nothing. Ask her nothing. Tell her what you know/ feel. The minute you start asking questions is the very minute this letter isn't the last.

^^^ That is a very good point. Just say goodbye and be done with it.