I kissed my best friends crush.?

There is a 'rule' that you shouldn't kiss anyone your friend dates/has dated or likes, but in this case she told you it was fine, if she had a problem she should have told you not to instead of saying "i dont like him at all'', do you have her phone number? If so try calling her or if you go to the same school then talk to her there and explain that you still want to be friends and you're very sorry . Speak to your other 3 friends aswell and try to explain and ask them for advice. Good luck!