I 100% agree with the first part of this, sending the note was a mistake even if the intentions were good. As far as the second part goes, I think the guy sho

I 100% agree with the first part of this, sending the note was a mistake even if the intentions were good. As far as the second part goes, I think the guy should just cut off contact with the old boss completely at this point. The damage is done, continued contact is likely to do more damage than good. If he sues you, he sues you, but contacting him proactively or in response to anything other than a formal legal setting should just be avoided.