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say, "i'm breaking up with you; this is why,..."
explain her everything, blame yourself too for what you did wrong, try to handle her emotions. just be a nice guy, even though breaking-up is a terrible thing, I think somewhere down the line she will realize that at least you were nice and mature enough to treat her right even during the break-up. most people start to become assh0les/bitches when they break-up and afterwards, and don't give reasons or valid reasons to explain why the break-up is the only option left, so that's really hard to get that out of your system because you're wondering why and how it is possible that the person you loved suddenly changes like this.
Give her a clear reason why and never leave her clueless - that's the worst you can ever do, to leave her clueless. Let her know what your intentions are, why are you breaking up with her - with all honesty. Thank her too for the wonderful memories you've shared. Help her move on by not totally contacting her after saying goodbye. Remind her of her worth as a person and let her know that things just don't work right and you need to do this because...
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