When should I reach out to him and how?

I have this guy friend in my friend group who seemed like he was flirting with me, so I told him I’m only interested in friendship, as I don’t feel a spark. He acted fine, but seems a bit distant. I care about him as a mate, but that’s it. I want to reach out, but I don’t know how. Or if I should. How should this be done?

When should I reach out to him and how?
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