Why does he always laugh at me?

My crush always laughs at me... Like when we are in a group one of the guys says "r you mad?" (hes joking) and my crush laughs... And he always asks me if I'm mad and my crush always laughs and then when I say I am not mad! He laughs again... And when they told me to turn in the work he started laughing I don't know why he always laughs at me? by the way he most likely used to like me and I think he likes someone else now

Why does he always laugh at me?
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