Is my fiancé right to be mad?

I had my bachelorette party last night and I got really drunk. I am not a drinker so this isn’t something that happens all the time. Well things got rowdy at the party and I slapped the singer of the band’s butt jokingly and my sister took a picture and posted it online. My fiancé saw it and he is furious saying that it was disrespectful of me to do that to him and that it’s borderline cheating. Is he right to be mad?

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