GIRLS I NEED YOUR OPINION ON THIS. WHAT DO I DO?

This guy used to be really flirty w me and whatever but suddenly he just stopped and kind of payed more attention to this other girl (who had a boyfriend). Right after this guy stopped liking me I began to like him but now I don't know what I should do to get him to like me again! GIVE ME FLIRTING TIPS I AM IN NEED
GIRLS I NEED YOUR OPINION ON THIS. WHAT DO I DO?
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