How do I tell him I'm no longer interested?

redpanda_
So I met up with a guy from a dating site recently, whilst keeping my options open (I've learnt the hard way not to have all my eggs in one basket). However, I have been talking to another guy and have also met up with him a few times now.
I'm starting to feel like I like the second guy more than the first, though the first guy is so lovely. I don't know how to tell him that I'm no longer interested (don't think it's a good idea to say that I'm more interested in someone else over him). I don't want to break his heart, he really is so nice and has a heart of pure gold but I've just had my head completely turned... I'd happily stay friends with him though... help
How do I tell him I'm no longer interested?
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