Definitely don't say there is someone else, that would fuck with my head a lot. But there's really not an easy way to do this, no matter what he's gonna be hurt... unless you guys aren't really serious, then it may not be a big deal. Just tell him you're not happy with the relationship anymore and want to move on. That's not really lying and you don't have to go into detail and tell him you're seeing someone else.
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-Sam
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