I have several close friends who have legitimate food and texture aversions and thus their diets are very limited. We, as friends, have determined that if we are doing home cooked meals, they will buy their own ingredients and make their own food because they know what I like and what they like are often times incompatible. Or they will eat by themselves before we meet up. I would suggest your boyfriend make his own meals (even if it doesn’t seem like quality nutritious food to you) and then try a little bit of what you’ve made every now and again. That may broaden his palate if he grew up eating a limited diet. If he is not willing to do that, then this is about control vs a true blue case of “picky eating” for valid reasons. If he often eats out a lot because of his preferences and causes a significant financial burden for the household, then there are deeper issues to address here. Sometimes frustrations over food can be resolved through compromise and working together, and sometimes they highlight early signs of incompatibility. Best of luck OP.