You need to do it gently! Explain to him why you don't like him anymore, and tell him that you guys are done. The longer you wait, the worse of a person you are, because if he thinks that you like him, you are deceiving him.
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It's important to be honest and direct with your feelings. You can try saying something like, "I've been feeling like our relationship is not working for me anymore, and I think it's best for us to part ways." It's important to have a calm and respectful conversation to communicate your feelings effectively.