Should I tell him?

There is a guy who has a crush on me.. he is a senior. I don't like how he follows me everywhere. I made a fake account on insta and send him friend request. He accepted it. Now he is asking who am I. Because he can't even think in dreams that I will send him a request. He thinks I don't know about him. What should I reply to his message? I want him to stop following me as it make me uncomfortable..

Should I tell him?
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