Please give me your opinions

Is being clingy to someone you just met okay? I'm talking with a guy who asked for my phone number. He's cute and sweet, but I'll be hanging out with someone in the halls, and he’ll ask who I was with, or when I tell him I'm going to bed, he continues to text me to ask if I'm awake every hour. I told him I liked a certain drink a day before, and he bought me it. It's really cute, I swear, but it's just because we only started talking a few days ago. He even talks about me on Instagram notes; I can literally see them. My brother said it's nice to have someone cling onto you, and it shows that they're interested. It's just.. I guess I'm not used to it. All the guys I liked were total assholes to me, but he's sort of different?