What shall a shy girl say to a flirty confident guy?

This boy I like is really confident and around him I get so shy I can't even look into his eyes for more than 5 seconds. Anyways he is really flirty but when he flirts I don't know what to say cuz I'm too shy. He always tries to make me laugh etc but I just don't know what to say back. We do have things in common e.g we both love football. So what shall I do?

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