Cooking dinner

Me and my boyfriend have been dating for a cool minute. 8 months. I usually make dinner but I only usually make one thing. Like, just the entree no appetizer or sides. It's not because I don't want to. It's just that usually I'm the one going to the store, cooking, and cleaning the kitchen after and he doesn't help with any of it. He works full time but I work part time, go to school full time, and am taking real estate classes. On top of that we don't live together yet I just spend the night every night. I feel like I just have the energy to cook everything. If I ask him for help he usually just says "one minute" and doesn't ever come in. Am I wrong for only cooking the entree? Should I be doing the whole Shabang? Do you think it will make him question the relationship? I hear that in some relationships the guy makes all the food so I mean, he could always say something if he wanted more stuff. Anyway, am I not being a good girlfriend for not doing sides/apps?