You should not let his choices deterr you. It might be easier on both of you if you use and adapt recipea you already eat rather than swithing to a whole new meal plan off the bat. Cook and eat what you would normally eat, but replace meat with tofu or textured soy and so on. Try new recipes every now and then and after a while it should become easier. If a part of the reluctance is because of perceived limitations, this should work to eliminate that.
I live with two omnivores and sadly the only vegans I know are my rabbits, but sticking to my diet is the easiest part of it all. I make my food choices and they eat their own, but we do make common meals. It's fairly easy to adapt recipes between us. Like pasta, rice dishes, salads, ethnic cuisine and even dessert. We prepare things together and we diverge when the recipes require it. The hard part is that they don't get it.