Am I the one who mess up the game? What should I do?

Anonymous
I met this guy 3 months ago online. I like him quite much. He flirted with me at the beginning, but I didn't really flirt back cuz I was not good at flirting. Recently he started to not reply my messages. Did I make him lose interest because I didn't flirt back and might make him feel "friend-zoned"? If so, what should I do to win him back? Did waste my chance by saying things only in a "friend" way and didn't flirt back? Should I blame myself?
Am I the one who mess up the game? What should I do?
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