This just gets better and better, Anon #1. You're both Catholics and share similar attitudes to premarital sex and parentood vs career, and your mothers are friends. You flirt with each other, he sat next to you at dinner, conversed with you all evening and had exaggerated gentlemanly concerns for your welfare, you're both into music, you're mates with his sister... sounds like I should be buying a hat!
Please, please, try something along the lines of what I said. You really need to give this guy some (very) heavy hints! He needs to know that you're single, that you wish you weren't, that you find him marvellous in every way, that guys who ask you out aren't causing offence but are welcome... in fact, everything short of you doing the asking.
Although in the event I didn't have to use it, I did have a 'plan B' with my CBPS. If the image makeover and the heavy hints about singledom, wishing guys would ask me out and not being offended by approaches hadn't worked, I was going to wait until he did or said something really kind and gentlemanly and then say outright 'You know, I'd give anything to have a boyfriend as gorgeous as you' or maybe even find some reason to burst into tears and then say the same thing. They're very gallant, CBPSs, and I'm sure he would have said 'But you can!'...
When are you seeing him next?