Does the boy I like have a personality disorder?

I like this boy a lot. We had a lot of AP cles together and he's VERY smart. Especially when it comes to math and sciences. He's already two years ahead of the rest of the most of my cl in math cles. He has several honors, at the state and national levels for math competitions, some of which have secured him many scholarships. He's amazing in yzing and writing literature as well. He's extremely attractive, with light blonde spiked and highlighted hair, blue-green eyes, standing about 6'2, and he's lean but has defined muscles. Every time I see him, it feels like there's ice instead of blood in my veins. I really like him, and to the naked eye, it would seem that he's just a normal AP student. He's on the track team and travels with the travel club as well. He sat in front of me in AP Chemistry last semester and that was when I began liking him. A lot. He'd always smile at me if I smiled first, and was even extremely chivalrous, which is rare for boys these days. He always seemed happy with his friends and everyone seemed to love him. At first. After some observance of this boy, I realized he seemed rather...unwell. His locker is beside of my best friend's, and my best friend HATES this boy. She says he's rude. I began believing this as well. My best friend and I are like sisters attached at the hip, and I began to see as she did. But as the semester went on, and as I met my best friend at her locker, the more peculiar this boy seemed. When people bumped into him and said "Excuse me," sometimes he stared on and seemed not to hear them. Sometimes he smirked at them. Sometimes, he seemed as if he didn't know what to say. He has a best friend with whom he is attached at the hip with as well, and his best friend, let's call him "John," always seems to be looking out for him. (So that this doesn't get confusing with two unidentified 'he's,' let's name the boy I like "Taylor.") In cl, Taylor and John are always together, and sometimes in the middle of lectures or work, when the teacher calls on Taylor or when someone says something to him, he seems clueless. Like he's forgotten how to speak. Even with his friends he'll get choked up, or forget how to speak, or smirk, or have a rude remark to snap. After a while, I transferred out of this AP cl and ended up with honors credit, but I'd always see Taylor in the hallways and sometimes he'd be behaving weird. I'd eventually come to the conclusion that he was just a jerk, a rude snob, just like everyone else umed, until I overheard a teacher with his name and 'personality disorder' in the same sentence. I feel sorry for Taylor and I worry about him a lot, especially now over the summer, because he just didn't seem right sometimes. I hope John will keep his thoughts far from suicide because Taylor said he wants to be a doctor and I know he'll excel at whatever he does and whether he and I develop something mutual or not, I hope he ends up happy. He's not stupid by any means. His friends actually seem to be more patient with him than all the others, and they seem to ignore his rude remarks and laugh with him. I'm just trying to figure out whether I should be worried about Taylor or if he's just a snobby jerk like everyone thinks.