Guys, what can make you think that your girlfriend is conceited?

Anonymous
Hi everyone, my boyfriend is really mad at me because he thinks I cannot accept the fact that I'm not the most beautiful woman for him. In fact, I do know I'm not the most beautiful, I told him that is allowed to think that blond girls (which have always been HIS type of girls while I'm a brunette) are more pretty, but it's better if he doesn't say it in my face. Since, he's really mad at me (to the point that he might breakup) and told me I'm conceited and immature. Did I act conceited or he is wrong? Thanks.
Guys, what can make you think that your girlfriend is conceited?
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