>>1 you can't judge a guy like that by his cover, seriously. He may seem like an arrogant prick but if she loves him then there's a reason. Trust me, I'm a girl like that. And yes you would be snatching because she's in love and in a committed relationship.
I don't think you're in love. Listen, if you truly loved her then you'd be focusing on her feelings and not your's. Again, personal experience, the guy I'm after is a player and yes I did try my best to wedge into his cold heart but only because he was obviously not in love with the girl. But what's different for me was that I would have backed off if he told me to, I was there as his friend, I confessed my feelings but told him that I wanted him to be happy with or without me and that being just a friend would be enough for me. You are focusing on your feelings and that's understandable but you can keep in touch with her after graduation, *cough* facebook. And you shouldn't be analyzing their relationship. That's just wrong. If she came to school with a black eye then that would be an exception.
Find your own girl, you can confess your feelings to her but don't force her into anything, keep her as a friend if that's what she wants. Focus on your career and you should be able to find that special someone that you know is the one.
And for the record,
>>5 has every right to say what he did, you asked for opinions, you can't just disregard someone's like that.