Boyfriend [22M] refuses to eat leftovers and I [24F] have a feeling it?s going to create issues moving forward

My boyfriend of a year and a half has some kind of mental hangup with leftovers. He doesn?t like them, whether they?re from a restaurant or home cooked, and generally refuses to eat them. If cooked food has been in the fridge for over a day he thinks it should be thrown away. He also wastes a fair amount of snack food (He?ll buy a whole container of chip dip from the store, eat it once, and let it get moldy. Or eat one pastry out of a box and let the rest get stale). I don?t know where this attitude originated from but it is really starting to bother me because I am the one who cooks all of our shared meals. He can?t cook and if he makes something for himself it is at most a frozen microwaveable. I like cooking for us and think I?m a decent cook. He enjoys my cooking and tells me as much often, but only if it?s just been prepared.
This might not seem like a huge deal, but this is the person I want to marry and start a family with. I don?t look forward to a living situation in which my partner expects me to make a new and distinct dinner every night if we?re not going out to eat. Yesterday I spent all day preparing a big pot roast with homemade cheddar biscuits for the two of us. He ate his portion of pot roast and a single biscuit, enjoyed it, but won?t eat any more of it today. So now I have to try to eat all the rest by myself. Like, what was the point of putting in all that effort?
I know the obvious suggestion might be to only make enough food for one meal but not only is that not always possible, but I don?t want to cook every single night for the rest of my life. It?s normal to make enough for leftovers to enjoy later. The food is still perfectly good! It?s also more budget friendly this way. I don?t meal prep for a whole week or anything but sometimes there?s enough food for another dinner and he won?t eat it so I?m stuck with both portions because I don?t waste food.
I don?t get it and I don?t know what to do. I tried telling him this upset me and he pretty much said it wasn?t a big deal, he didn?t understand why I was overreacting and that I was being crazy. He said ?sometimes I eat leftovers? and I asked him to give me an example and he said Thanksgiving. That was 6 months ago!
Tl;dr boyfriend refuses to eat leftovers and I imagine this will cause problems in our home life down the line. It?s already getting on my nerves.
Edit: One thing I?d like to add is that if we have children in the future I think this will set a bad precedent. I will expect my kids to eat leftovers, and I don?t want them taking dad?s refusal (and decision to get McDonald?s instead!) as an example. Ideally, the whole family should eat together at mealtimes as often as possible.


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