Why does my boyfriend gets upset when I forgot to eat?

As the title says sometimes I forgot to eat or I simply don’t eat enough. Instead of breakfast, I have coffee and usually, I eat one meal a day aside from sweets and candies). My boyfriend found out about my “habit” and he was upset with me. He rant about it and said how I have to eat. I told him that I simply forget about it and most of the time I don’t have the appetite. The other day, he came to my place carrying bags and cooked lunch because he thought I wouldn’t eat. I understand that he is caring and thoughtful, but it’s weird to me because I’m not used to someone taking care of me.
Why does my boyfriend gets upset when I forgot to eat?
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