How to initiate a breakup conversation with someone who's head over heels in love with you?

He doesn't see this coming at all. He's very in love with me but I don't feel the same anymore. I'm busy with my studies and I just don't want a relationship now. How should I start this conversation, any ideas? Again, this will be completely out of the blue for him.. :/
How to initiate a breakup conversation with someone who's head over heels in love with you?
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