Call him back and just listen. he might say things that you know aren't true and will at times sound like an alien abducted him and say things that are outrageous.
Hold you tongue and just listen no matter how offended you become. Understand that it is how he feels right now. They are his feelings. Don't make them become yours but sympathize with him.
Keep the conversation short and sweet.
thank you mr bond. i met with the counselor and she told agreed with your advise to listen and that a short note from my heart is good. i don't want to escalate and let the message get lost in any fury. now, i need to think about what to write and not judge or make him anymore ashamed so i could draw him out a little. i don't want to rush this time just because of being hurt and shocked. any ideas for the note content mr bond?