I am 20. Why this guy said that he was 17 year old while he is 19?

I know this guy for months. And i never had feelings for him. But since past few days he has been flirting with me over text. He complimented me a lot. And i started to like him little. Now he is’nt behaving same. Yesterday He lied that he is 17. What does it mean? Is he playing with my feelings.

I am 20. Why this guy said that he was 17 year old while he is 19?
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