How to show disinterest after a few dates?

I've had 2 dates with some guy thus far and I'm pretty sure he likes me. However, I was in doubt if I liked him at first, but I now realise I wouldn't want to keep dating him. So I decided to tell him.

But when is the time right, because it wouldn't be smart to throw something like this at him during Christmas time. So I was thinking maybe between Christmas and new year. Is that wise? Just so he doesn't enter 2018 with false hope.

Concerning telling him. Should I simply tell why I'm disinterested, that I'm disinterested or throw it on not feeling anything romantically.

What would you guys like to hear in this situation?

How to show disinterest after a few dates?
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