you can be direct but still be nice, just be like Hey so and so, i have had a really nice time getting to know you and you have done nothing wrong, but i feel I haven’t really felt a romantic spark for you. I wanted to let you know so I don’t lead you on in the future. You are a nice guy and I wish you the best in finding the person for you.

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you can’t control how he reacts and if he reacts badly it is not your fault and you dodged a bullet regardless how you felt for him

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