I want to move on but how can I say it respectfully to the guy I like?

I'm getting tired of loving my guy friend. I think I really need to stop chatting with him, he loves our connection but he cannot reciprocate my feelings for him. How can I say it in a respectful way that I need time to heal and move on? We may drift apart yes but I am tired. I'm just so tired.
I want to move on but how can I say it respectfully to the guy I like?
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