should i apologize?

hello i have a ed and still having a hard time to eat and last night i didn't eat anything because i don't feel like eating and i don't deserve to eat because of the score that i got to my 2 quiz yesterday. And my friend found out that i didn't eat and got mad at me because i didn't eat anything... they told me not to talk to them... should i say sorry for not eating? i don't think i did anything wrong though.

ps: my friend doesn't know i have ed and i don't want to tell them because it will make everything awkward.

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