Is my boyfriend justified in telling me to not take part in an event at my college?

My college is holding this event where girls get to ramp walk, and I love ramp walking so I told my boyfriend I'm gonna do it. He then told me not to because apparently I draw attention to myself because of the way I walk. I asked him what he meant and he said that my chest and ass bounce while I walk and it might be considered "too sexual". I told him he was being ridiculous and then he tried to emotionally blackmail me by saying that he's not a bad person for making sure other guys don't lure over me. Is he justified?

Is my boyfriend justified in telling me to not take part in an event at my college?
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