Would you prefer being told when a girl isn't interested anymore?

Hello! The thing goes like this. I met this giy through instagram and he was cool at first but then started sending me messages everyday at morning and night; and being kind of stupid but I kept being nice. However, I'm not interested anymore... Should I tell him that I'm not interested or just ghost out of this? What would you prefer? Because he surely will want a reason... So what can I tell him?
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Thanks! What if he keeps on sending me messages?
Would you prefer being told when a girl isn't interested anymore?
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