I did send him the email. It was mostly about the way we'd talked that evening, particularly on the phone. I told him how it felt to me, I expressed my understanding of feelings he's shared, including being afraid, which I have also felt.
I confirmed that I had been consistent in preferring that we move forward together-- by dating, exploring, having fun together and giving ourselves the time we need-- but have not stood in the way of his decision-making.
I did also share at the end my feelings about being ambushed with D papers, nothing drawn out, just how I felt in one very simple sentence. Told him I hope it gives him what he needs and to let me know when he wanted to discuss our agreement and how he wanted to handle things.
I started and ended by thanking him for little things he's done lately for me that I genuinely appreciate-- offering advice about my cat not eating and also his opinion about something I'd been thinking about regarding our home.
Overall, I think it was a positive email, affirming of what he'd shared and also clearly expressing my feelings and taking my part of the responsibility for where I contributed to what I felt was difficulty in talking earlier.