Weirdest big argument ever

I’ve been with my boyfriend for almost two years and at this point have seen each other at our worst. The other day in class the teacher asked me to help him fix his essay, he said that he had quote dropped. Quote dropping is when you do not have a transition phrase for a quote or a citation. I go to correct his little mistake and he said that he didn’t do what the teacher had just said and it was fine. We argued and argued and then I just left and neither of us talked for the night and didn’t make up till 3rd hour the following day. I get on the phone with him later saying I corrected his friends essay and made a joke saying “those two boys and quote dropping” and he got mad and said he wanted to stop talking on the phone. It’s small and stupid and he’s never this way about a lot of things. He’s not good at English so I don’t know why he’s so against me helping him. He will never admit he’s wrong. And here we are fighting again 🤷‍♀️