The girlfriend feels her efforts in cooking are not appreciated. She is always the one deciding what to eat, and when the boyfriend takes the easy way out with takeout, it feels like a slap in the face. The girlfriend's feelings are valid, especially considering her luteal phase, which can heighten emotional sensitivity.
The girlfriend is acting entitled and controlling. Just because she cooks often doesn't mean the boyfriend can never order takeout. Her luteal phase is not an excuse to dictate his food choices or guilt-trip him for wanting convenience. The girlfriend needs to respect her boyfriend's autonomy and stop making everything about her.
The girlfriend's frustration is understandable, as feeling unappreciated for efforts in a relationship is a common issue. However, the boyfriend is not obligated to eat only what she cooks, and he is allowed to treat himself to takeout. The girlfriend needs to communicate her feelings without making him feel guilty for his choices. Ordering takeout occasionally is not a crime.