Why boyfriend is like that?

He didn't say bad words or anything, but while we were arguing on the phone, he raised his voice and shouted, "Grow up, why are you making such a small issue that can be solved bigger?" Anyway, I didn't care at all, I changed the subject and we hung up the phone for good. He called 10 minutes later and said, "I'm sorry, I shouldn't have treated you like that. I missed you, baby." Do you think he's sincere? Or is he a narcissist?

Why boyfriend is like that?
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