Is it normal to care about someone that doesn't care about you?

Its not that we are close, and this person is treating me bad. Its just that this person and I were close for 2 1/2 years. He was a guy friend, and we grew apart. The way it happened was immature on his part. For awhile I hated him. Now that I'm older I don't think we'll bond the same but I always felt connected to him. Its like when I see him I feel certain vibes. Maybe its just me. I got over us being friends but I wouldn't mind seeing him around sometimes. We have mutual friends. With them he's more talkative and himself. With me he see's that I'm quiet, and he always pretended to act gay and playful. He's much taller so he'd try to stand tall infront of me and stuff. And I'd feel awkward. He or I aren't gay but I always feel vulnerable around him. Not even guy friends I hung out longer with made me feel this way. He clearly doesn't notice me like he use to but I still have a soft spot for him.