Many many many years ago OP, we had a client that was so drop dead gorgeous that EVERYONE was talking about him.
I'd been on holiday for a week, moving house after the break up of a long term relationship, and the first client to come and see me was this guy. He was, indeed, incredibly attractive - 6'4", of very exotic descent with beautiful eyes, you get the idea. I suspected he knew it though, so I was polite and professional but aloof!
Long story short, he asked me out. Hahaha! Me! I'd just lost 3 stone through stress but had been quite fat, was living in a tiny flat on my own and my dad had to help me with rent. I was wearing clothes 3 sizes too big for me because I couldn't afford new ones, I was a catch.
I seriously considered saying no, but said yes because I actually assumed he didn't really mean it and he'd cancel. But he didn't, in fact he cancelled a work dinner to take me out instead.
Bizarre, but okay. Anyway, I went out with him for 6 weeks. And although it was a boost to my confidence and fun to be paraded around on his arm for a while, and he wasn't arrogant at all really - he was simply very annoying. Childish, incapable of meaningful discussion, and had a nasty habit of dreaming up drama just for larks. He was also a bit thick, and his so-called friends seemed to make it their mission to chat me up in front of him and he was oblivious.
But for what it's worth, other women didn't worry me, he never made me feel bad about his numerous exes and he was nice about them, and I never felt insecure because although he was an idiot he wasn't an arsehole.
I still finished with him though, he even wrote me a letter saying he had all these "feelings" for me. Awks. 
It was fun though, and unlike me you already know this guy to be someone you get on with. Hope you can talk to him tonight - good luck, give it a try!