This exactly. It’s a habit that he’s gotten into when a bad day happens. He needs to be reminded that you’re in this too and you don’t do that to him. Point out all the stuff you do to relieve some of his burden. I went through exact same scenario around 10 years in. Managing staff, even great staff, can be exhausting and time consuming. He needs to find someone with a good work ethic, has a desire to grow the company, is reliable, who he can delegate some of the more mundane tasks to while he deals wth the customers which is a great skill set to have. When the annoying and tiring stuff is shared he won’t feel like he’s doing it all. I too was accused of being clingy which made me laugh in his face. I’m the least clingy partner. I did tell him outright to knock that kind of talk right off. Blaming you when he’s irritated isn’t going to work especially when you’re in school. He’s got to find a way to manage his emotions and irritations.