Will ignoring a guy work?

I have been flirting with a guy for a month or so now, and I am almost 100% sure he likes me back. I have been ignoring him for the past 5 days or so to see what his reaction would be. I mean, I talked to him every day last week and now I'm playing hard to get. Does this work or will it just backfire?
Will ignoring a guy work?
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