I read your posts and feel you're getting a hard time and I then too thought are you ND. Because you're so concerned about how you've communicated and how someone receives you. It says you have a history where people have treated you a certain way. It has set up a loop where you're so worried about this response potentially.
You've sent it. Try not worry because your boss probably has so much to deal with, lots of emails and your tone isn't going to be at the front of his brain more than 5 minutes.
Next time you see him, smile, say hi. Then do and say nothing. Leave it. You haven't killed anyone. It's a little blunt. Id laugh if I got that. Id think ' oh do I tend to blame or '. Maybe boss needs self reflection time tbh.
Sometimes people like things fluffed up. My Autistic son says this is such fake bollocks. I agree yet explain people feel good with a bit of fluffery e.g. ' hope that helps ', ' if I can hehp' etc. ( with the boss at least). If it's not about you, don't bring you into it if you can avoid ( emg it wasn't me).
It sounds like you didn't really need to tell the boss this information in the first place. Id stick to what's yours, don't take on others crap at work.
Id look at finding ways to escape voices in your mind ( we all have them) that make you repeat scenarios, worry about them, worry what people think. Yes we all do it but there's a history here and it sounds really stressful for you.
Your boss sounds like a dick blaming people unnecessarily at times. So don't offer up anything to win them over. Do your job only, smile if you're worried you seem too blunt after that then business as usual.