Totally different, but I dated a girl that was the absolute meanest in the morning. Yell at me, call me names, hit me and she would supposedly never remember any of it but then would be upset when I'd left before she "got up." I dealt with it way too long, I understand being grumpy in the morning though as I'm not a morning person and some days/nights can be crazy so I try to be as reasonable as possible with morning grumpiness type things. It wasn't until she kicked me off the bed one night and was yelling at me for no reason and telling me I couldn't sleep there but couldn't leave that I ended it (among other factors, but that was the last straw). She got mad the next morning wondering where I had gone and why I left. This girl beat me up every morning and was upset if I left because she told me to leave.

Just have the conversation with him and calmly discuss and work it out. Give each other time to think through whatever the problem each of you is seeing is and give each other time to process and think of a response. I didn't read the whole post, but the title says you're acknowledging there's a problem and want to solve it so that's always a plus in my book!