How do I break up with him?

OK so this guy I've been dating for a month is really sweet and nice. But he lives a few towns over and we don't see each other very often. And I also like another guy. And the other guy likes me and he gonna ask me out (I found out from his friends). I don't wanna break up with him after a date because what's the point of having so much fun and right when I about to leave I break up with him? Can I break up with him on the phone? Thanks.
How do I break up with him?
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