Question to black people?

So my black boyfriend told me "you probably think that I'm a black-a** n****r." And he was kinda upset when he was saying that.
I was like, oh no, no way, I don't think that and we settled.
But I have no idea what he meant.
Ik it's derogatory word and I don't use it. I have no idea what he meant.
What could I possibly be doing for someone to tell me that?
I'm really curious.
Question to black people?
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