Is he flirting with me?

So I’m pretty clueless when it comes to flirting, but this guy who I’ve liked for 4 years was teasing me about the kind of music that I like, when he likes the exact same type of music. My sister said he’s flirting with me especially since he has liked me in the past, but I’m not sure if he is.
Is he flirting with me?
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