This was six days ago. I hope you went out with him. Just because he was arrogant upon first meeting him doesn't mean that's how he is when he is just with you. Mixed company often calls on us to harness different parts of our personality. So who knows? Maybe in private you'll see all that ego is just a defensive mechanism for some insecurities he has but doesn't sghare until he's ready to be vulnerable around someone. That someone can be you. We never get a second chance to make a first impression, but we sometimes our first impression isn't going to be our best one.