How to break it off with him?

Im 26, I've been seeing this guy (also 26) for about a month and a half. He's someone I really like as a person but that I'm not feeling chemistry with. I was hoping the chemistry would catch up but it has not. It just makes me sad because I really WANT to be into this guy. He's really a quality person. I'm just sadly not feeling it. And I know I need to end it. But what do I say? I feel like saying there isn't chemistry is mean. I don't think he's gross. I just don't feel it you know?
What's the best way to approach him about this?
How to break it off with him?
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