How do I know if this annoying boy likes me?

Theres this guy in my class. He's kind of inmature for his age, but he acts like he likes me. He'll make fun of me and stuff, but then he'll be all sweet.he never acted like tis before with me . I think I might like him, and I want to know if he for sure does like me. what do you think?
How do I know if this annoying boy likes me?
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