Haha, Hopeful, I tend to be pretty clueless too! I know I am dating, but I really kind of s*ck at reading the clues, you know?
Just pin them to his forehead. Listen, H constantly forgot things I told him, emailed him, pinned on calendar. Stop emailing if he is being a jerk (I get so many emails....)
Phone if it concerns D and let him know you will also send an email. Other than that you could leave a calendar or text.
Yesterday I got the "What's the point in having a cell phone if you never answer it??" speech.
I just laughed and said if it is an emergency you know how to get in touch....