Update: he read the email and then a few minutes later he texted 'see you on Friday'. Lol. Then we had a few back and forths about the weekend, he said he had to work a chunk of Sunday (would have been good for him to have told me that last night).
No mention of the email, but I wouldn't expect there to be. I'll let it sink in and have him reflect on it. I did say in the email how I'd noticed all the changes he'd made and that this was impressive given it's his busy and stressful time of year and when the winter has been so gloomy.
So, probably as good as I could expect right now. I can't force him to open up to me. I can't force him to do anything. But I feel better for telling him that I want to get to know him better, and that it's hard for me too to let down my defences. I won't push it any more, now I just need to be patient and wait for him to get over this work stuff. *sits on hands*