How do I let a guy friend down nicely?

confusedperson2002
A male co-worker recently asked me out. We had always been friendly, sometimes went out in a group setting. I've known him for a bit over a year but he was in a relationship, so I didn't consider him as someone I'd be interested in, but I said yes to him because he's a nice guy.

Anyways, his girlfriend broke up with him in June and he asked me out literally a week and a half ago. Before our first date he bought me snacks and put them in my locker at work, he showed up on his day off just to talk to me, and he even asked me to be official after our first date and then he ended a few of our text convo's with "ILY".

After about a week I feel as though I don't have romantic feelings for him (or I just felt super pressured to feel a certain way soo fast I got turned off?). So now I need to tell him but I don't know how to go about this in a nice way. And also before our first date he even swapped work schedules so he could work on the same day as me. Pls give helpful advice.
How do I let a guy friend down nicely?
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