He's leaving

[sage]

I would tell him exactly what you've told us in your post. That you wrote the letter in the worst throes of anger, hurt and sadness and that it was helpful for you to get it out but that yes, feelings change and you feel as though you've moved way past where you were when you wrote the note.

Assure him that you didn't put it in there for him to find.

After you make it really clear that you don't still feel the same way, I would err on saying less not more. IOW, one thing I've learned in my sitch is that not everything has to be discussed as nauseum right this minute. I would do a thorough job of assuring him that you don't want a D and that the letter reflects feelings of old.

Sage

PS CALL HIM!