Guys, Should a man at least tell a woman he is not interested?

Anonymous
If a woman contacts you and say I am interested in you or how are you doing? Should a man at least tell her I am not interested instead of ignoring her? Why can't the man just say, I am not interested anymore and I have moved on? Why just ignore? Advice?
Guys, Should a man at least tell a woman he is not interested?
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