“Dear Clark,
When you left my room so abruptly, I thought something was very wrong. I won’t put what I thought in writing, because I’d never want to cause you harm or undue stress. We’ve both been through enough of that, but I noticed you were acting strangely.
At first I was both hurt and concerned. Upon reflection, however, and reviewing the words I said, I understand why you reacted the way you did.
I am so sorry, Clark. I didn’t mean to make you feel uncomfortable or threatened, but I can understand that that’s how my words may have been interpreted by you. I should have been more careful and chosen my words more wisely.