My boyfriend called me a failure during an argument and I'm not able to forget it. What do I do?

My boyfriend and I were having an argument in which I was being sarcastic towards him and told him he's failing miserably at mimicking me, to which he replied well unlike you I don't fail. This pissed me off and hurt me, so I was also responsible for dragging the argument for too long lol. I was hurt because he knows I'm insecure about my intellect and have always been taunted for being "second best" by my family, and still chose to bring up my past failures ( I failed 3 times in school, big deal). Added to that he's the cookie cutter model student always getting good grades. He apologized for it and said that he genuinely doesn't think I'm a failure, but it's still there in my mind. What do I do so that I don't end up resenting him?

My boyfriend called me a failure during an argument and I'm not able to forget it. What do I do?
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