Is disrespecting a major flaw in a guy?

So I’m in this casual sex thing with a guy for 2 months now... we always agreed it would be a casual thing with mutual respect to each other. Until 2 days ago, we stayed awake all night, no sex or anything, just talking and he confessed he was getting used to the situation. He wasn’t sure if it was a good or bad thing. Then next day, at a small gathering with our friends, he kissed a girl right in front of me. I felt disrespected cause I never did that to himself. Am I overreacting? I don’t know what to do now, cause I feel like the respect we had for each other is now gone.
Is disrespecting a major flaw in a guy?
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