text: Common Sense. Treat him/her the same. They were probably bi before you even met him/her, which means you liked them, them telling you does not change anything except for the fact that you know now.\n\nYou would betray your friends trust by treating him or her badly. Evidently he or she trusts you to tell you such a personal thing.\n\nIf you treat him or her differently then you are become the problem, and a bad friend.