Boyfriend mad at me but is it my fault?

Anonymous
Boyfriend told me he is working on Sunday, i act surprised because I didn’t think he was working then. It’s the first time I know of it. He says he told me multiple times but he genuinely didn’t.

Like I have a good memory I don’t have dementia why would I be surprised if he told me something lots. Now he’s mad at me and says he definitely told me. So I agreed with him cause he’s mad but am I in the wrong here?
Boyfriend mad at me but is it my fault?
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