My boyfriend and I had an argument?

It takes him so long to understand something that hurts me. To the point where I just want to end things. After I tell him that then he understands but then say he needs time for himself because I was mad. He would say something like "well I won't care, so I didn’t think you would" but then when I say it hurts he wouldn’t get it. I’m frustrated that he never understands, and that is takes much for him to understand and apologize. He would in a way turn it on me. What should I do?
My boyfriend and I had an argument?
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