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It sounds a bit weird but it has helped me a LOT in the past as, especially when a lot of emotions are involved, I have a tendency to get really tongue-tied and lose my train of thought just like that.
.. make a list of specific occurrences that have led to this decision to end things. Keep it short and sweet but yeah, as specific as possible. When you tell him that you want to break up, say it in a definitive tone. Sounding like you're sure as hell of this, rather than broaching it as a discussion topic.