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If you truly believe that you had the best of intentions, and you did indeed "stop" the kiss from proceeding, then I don't think it's a problem to keep things from getting messy. You are young and still in school, which is a time when that sort of behavior is excusable.

On the other hand, if you believe that you made a mistake and the girl deserves better, then you should probably let her know. Some things are better when kept secret.