How should I break up with him?

I have been with my boyfriend for over a year after a lot of soul-searching I have realized that I don't really love him or want a relationship with anyone. He has talked about marriage and kids from the beginning and I just don't want that. I don't want to hurt him but I'm just not happy in this relationship. How can I break up with him without hurting him?

How should I break up with him?
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